Boston Marathon bombing

=== Further investigation and post-shootout search for Dzhokhar Tsarnaev ===
{{further|Dzhokhar Tsarnaev|Tamerlan Tsarnaev}}
<!-- Please do not add details on the lives of the suspects, unless it is connected to the bombing by a reliable source. See discussion on the talk page. -->
Records on the Honda left at the Watertown shootout scene identified the bombers<ref name="Honda Civic Evidence">{{cite web|url=http://investigations.nbcnews.com/_news/2013/05/01/17991679-green-honda-could-prove-crucial-if-tsarnaev-charged-in-mit-officers-killing?lite |title=Green Honda could prove crucial if Tsarnaev charged in MIT officer's killing – Investigations |publisher=Investigations.nbcnews.com |date=August 29, 2010 |access-date=July 24, 2013}}</ref> Tamerlan and Dzhokhar "Jahar" Tsarnaev.<ref name="Slate pronunciation" /><ref name="AtlanticWire04192013" /> The FBI released additional photos of the two during the Watertown incident.<ref name="Philippe Naughton" /> Early on April 19, investigators released the name and photo of Dzhokhar Tsarnaev to the public.<ref name="auto1"/> In addition, Watertown residents received automated calls asking them to stay indoors.<ref name="AutoLC-74" /> That same morning Governor Patrick asked residents of Watertown and adjacent cities and towns<ref>Boston, [[Belmont, Massachusetts|Belmont]], [[Brookline, Massachusetts|Brookline]], [[Cambridge, Massachusetts|Cambridge]], [[Newton, Massachusetts|Newton]], and [[Waltham, Massachusetts|Waltham]]</ref><ref name="AutoLC-75" /><ref name=cisomerville /> to "[[shelter in place]]".<ref name=nationRawlings /> [[Somerville, Massachusetts|Somerville]] residents also received automated calls instructing them to shelter in place.<ref name="AutoQU-4" /> 

A 20-block area of Watertown was [[Cordon and search|cordoned off]] and residents were told not to leave their homes or answer the door, as officers scoured the area in tactical gear. Helicopters circled the area and [[SWAT]] teams in armored vehicles moved through in formation, with officers going door to door and searching houses.<ref name="AutoLC-76" /> These actions generated discussions about the legality of searching large numbers of houses without a [[search warrant]], with ''[[The Atlantic]]'' stating that this kind of search is legal due to [[exigent circumstance]]s.<ref>{{Cite web |last=Bump |first=Philip |date=2013-04-22 |title=Boston's Door-to-Door Searches Weren't Illegal, Even Though They Looked Bad |url=https://www.theatlantic.com/national/archive/2013/04/boston-door-to-door-searches-legal/316042/ |access-date=2022-09-06 |website=The Atlantic |language=en}}</ref> Agencies on the scene were the FBI; the Bureau of Alcohol, Tobacco, Firearms, and Explosives; Diplomatic Security Service; HSI-ICE; [[National Guard of the United States|the National Guard]]; the Boston, Cambridge, and Watertown Police departments; and the [[Massachusetts State Police]]. The show of force was the first major field test of the interagency task forces created in the wake of the [[September 11 attacks]].<ref name="AutoLC-77" />

The entire [[Massachusetts Bay Transportation Authority|public transit network]] and most Boston taxi services{{Efn|Taxi service was restored before the manhunt ended and transit service resumed.<ref name="AutoQU-5" />}} were suspended, as was [[Amtrak]] service to and from Boston.<ref name="lowery" /><ref name="Logan and Taxis" /> [[Logan International Airport]] remained open under heightened security.<ref name="Logan and Taxis" /> Universities, schools, many businesses, and other facilities were closed as thousands of law enforcement personnel participated in the door-to-door manhunt in Watertown. Others followed up on other leads, including searching the house that the brothers shared in Cambridge, where seven improvised explosive devices were found.<ref>{{cite news|url=http://usnews.nbcnews.com/_news/2013/04/20/17823265-we-got-him-boston-bombing-suspect-captured-alive|title='We got him!': Boston bombing suspect captured alive|last1=Williams|first1=Pete|last2=Esposito|first2=Richard|date=April 8, 2015|work=NBC News|access-date=April 8, 2015|last3=Isikoff|first3=Michael|last4=Connor|first4=Tracy}}</ref>

The brothers' father spoke from his home in [[Makhachkala, Dagestan]], encouraging Dzhokhar to: "Give up. You have a bright future ahead of you. Come home to Russia." He continued, "If they killed him, then all hell would break loose."<ref name="AutoLC-80" /> On television, Dzhokhar's uncle from [[Montgomery Village, Maryland]], pleaded with him to turn himself in.<ref name="AutoLC-81" />

Also on April 19, the FBI, [[West New York]] Police Department, and [[Hudson County, New Jersey|Hudson County]] Sheriff's Department seized computer equipment from the apartment of the Tsarnaevs' sister in West New York, New Jersey.<ref name="AutoLC-52" /> 

[[File:JaharTsarnaev.jpg|thumb|Dzhokhar Tsarnaev at the time of his capture]]
[[File:MissionHillCaptureCelebrations.jpg|thumb|Post-capture celebrations in Boston's student-heavy [[Mission Hill, Boston|Mission Hill]] neighborhood]]

On the evening of April 19, after the shelter-in-place order had been lifted, David Henneberry, a Watertown resident outside the search area, noticed that the tarpaulin was loose on his parked boat.<ref name="AutoLC-83" /><ref name="BBCboat" /> Investigating, he saw a body lying inside the boat in a pool of blood.<ref name="AutoLC-84" /> He contacted the authorities at 6:42 p.m., and they surrounded the boat. A police helicopter verified movement through a [[thermal imaging]] device.<ref name="captured" /><ref name="AutoLC-85" /> The figure inside started poking at the tarpaulin, prompting police to shoot at the boat.<ref name="AutoG4-1" />

According to Boston Police Commissioner Ed Davis and Watertown Police Chief Deveau, Dzhokhar Tsarnaev was shooting at police from inside the boat, "exchanging fire for an hour".<ref name="USA Today">{{cite news |url=https://www.usatoday.com/story/news/nation/2013/04/19/suspect-in-custody-newspaper-says/2095845/ |access-date=April 20, 2013 |title=As manhunt ends, new questions emerge in Boston bombings |author=Johnson, Kevin |work=USA Today |date=April 20, 2013}}</ref> A subsequent report indicated that the firing lasted for a shorter time.<ref name="auto">{{cite web|url=https://www.washingtonpost.com/world/national-security/officials-boston-suspect-had-no-firearm-when-barrage-of-bullets-hit-hiding-place/2013/04/24/376fc8a0-ad18-11e2-a8b9-2a63d75b5459_story.html|title=Officials: Boston suspect had no firearm when barrage of bullets hit hiding place|first1=Sari|last1=Horwitz|first2=Peter|last2=Finn|date=April 24, 2013|access-date=October 15, 2017|via=www.WashingtonPost.com}}</ref> Despite this, Tsarnaev was found to have no weapon when he was captured.<ref name="AutoLC-87" />

Dzhokhar Tsarnaev was arrested at 8:42{{nbsp}}p.m.<ref name="autogenerated2" /><ref name="autogenerated1" /> and taken to [[Beth Israel Deaconess Medical Center]], where he was listed in [[Medical state#Serious|critical condition]]<ref name="AutoLC-88" /> with gunshot wounds to the head, neck, legs, and hand.<ref name="AutoLC-89" /> Initial reports that the neck wound represented a suicide attempt were contradicted by Tsarnaev's being found unarmed.<ref name="AutoG4-2" /> The situation was chaotic, according to a police source quoted by ''[[The Washington Post]]'', and the firing of weapons occurred during "the fog of war".<ref name="auto" /> A subsequent review by the Commonwealth of Massachusetts provided this more specific summary: "One officer fired his weapon without appropriate authority in response to perceived movement in the boat, and surrounding officers followed suit in a round of '[[contagious shooting|contagious fire]]', assuming they were being fired on by Tsarnaev. Weapons continued to be fired for several seconds until on scene supervisors ordered a ceasefire and regained control of the scene. The unauthorized shots created another dangerous [[crossfire]] situation".<ref>{{cite web |url=http://www.mass.gov/eopss/docs/mema/after-action-report-for-the-response-to-the-2013-boston-marathon-bombings.pdf |title=After Action Report for the Response to the 2013 Boston Marathon Bombings |date=December 2014 |website=Government of Massachusetts |publisher=Executive Office of Public Safety and Security |access-date=October 10, 2017 |quote=Improvement Area 4, Lack of Weapons Discipline, page 114}}</ref> The confusion was caused in part by a lack of clearly identified and coordinated law enforcement command of the thousands of officers from surrounding communities who self-deployed into the Watertown area during the events.<ref>{{cite web |url=http://www.mass.gov/eopss/docs/mema/after-action-report-for-the-response-to-the-2013-boston-marathon-bombings.pdf |title=After Action Report for the Response to the 2013 Boston Marathon Bombings |date=December 2014 |website=Government of Massachusetts |publisher=Executive Office of Public Safety and Security |access-date=February 20, 2020 |quote=Improvement Areas 4.1 and 4.8, pages 113 & 117}}</ref>

After Dzhokhar Tsarnaev was taken into custody, the FBI revealed that it had investigated Tamerlan Tsarnaev in 2011 after a foreign nation had expressed concern about his potential radicalization. That investigation had included an interview of Tamerlan Tsarnaev. At that time, the FBI found no evidence of terrorist involvement by Tamerlan Tsarnaev.<ref>{{cite web|url=https://archives.fbi.gov/archives/news/pressrel/press-releases/2011-request-for-information-on-tamerlan-tsarnaev-from-foreign-government |title=2011 Request for Information on Tamerlan Tsarnaev from Foreign Government |website=archives.fbi.gov|date=April 19, 2013}}</ref>

On April 24, investigators reported that they had reconstructed the bombs, and believed that they had been triggered by remote controls used for toy cars.<ref name="la-times-bombs-triggered" />