Boston Marathon bombing

=== Watertown shootout ===
Shortly after midnight on April 19, Watertown police officer Joseph Reynolds identified the brothers in the [[Honda]] and the stolen Mercedes after overhearing radio traffic that the vehicle was "pinged" by Cambridge officers on Dexter Avenue in Watertown. Reynolds followed the vehicle while waiting for additional units to perform a high-risk traffic stop when the suspect vehicles both turned onto Laurel Street and stopped at the intersection of Laurel and Dexter.{{cn|date=December 2023}}

Tamerlan Tsarnaev stepped out of the Mercedes and immediately opened fire on Officer Reynolds and Sergeant John MacLellan, who both returned fire and requested emergency assistance over their radios. A gun battle ensued between Tsarnaev, the aforementioned officers, and additional officers responding to the "shots fired" radio transmissions from Reynolds and MacLellan in the 100 block of Laurel St.<ref name="NY Times Standoff" /><ref name="captured" /><ref name="Watertown firefight, Globe" /> An estimated 200 to 300 shots were fired. The suspects shot 56 times, detonated at least one pressure cooker bomb, and threw five "crude grenades", three of which exploded.<ref name="Watertown firefight, Globe" /><ref name="AutoLC-65" />

The agencies involved in the nearly seven-minute shootout included the Watertown Police Department, [[Cambridge Police Department]], [[Boston Police Department]], [[Massachusetts State Police]] (MSP), [[Boston University]] Police Department, and MBTA Transit Police Department. Most of the officers involved were equipped by their respective agencies with either the [[Glock 22]] or [[Glock 23]] [[.40 S&W]]-caliber pistols. MSP troopers were armed with [[Smith & Wesson M&P|Smith & Wesson M&P45]] pistols chambered in [[.45 ACP]]; this led investigators to match the [[9mm]] casings and projectiles found at the scene to the suspects' 9mm [[Ruger P95]] pistol.

According to Watertown Police Chief Edward Deveau, the brothers had an "arsenal of guns".<ref name="Tucson Citizen" /> Tamerlan eventually ran out of ammunition and threw his empty Ruger pistol at Watertown PD Sergeant Jeffrey Pugliese, who subsequently tackled him with assistance from Sergeant MacLellan.<ref name="DeWitt2013">{{cite news|last1=DeWitt|first1=Vincent|title=Watertown Mass. Police describe takedown of Boston Marathon bombers|url=https://nypost.com/2013/07/08/exclusive-watertown-mass-police-describe-takedown-of-boston-marathon-bombers/|access-date=March 26, 2016|work=New York Post|date=July 8, 2013}}</ref><ref name="Smith2016">{{cite news|last1=Smith|first1=Tovia|title=Filming For Marathon Bombing Movie Stirs Emotions In Boston|url=https://www.npr.org/2016/03/25/471755112/-its-going-to-trigger-lot-of-ptsd-boston-prepares-for-marathon-bombing-film|access-date=March 26, 2016|work=NPR|date=March 25, 2016}}</ref>

Tamerlan's younger brother Dzhokhar then drove the stolen SUV toward Tamerlan and the police, who unsuccessfully tried to drag Tamerlan out of the car's path and handcuff him;<ref name="DeWitt2013" /><ref name="Smith2016" /> the car ran over Tamerlan and dragged him a short distance down the street, narrowly missing the Watertown officers. Watertown Sgt. MacLellan later stated that the younger brother had thought they were doing [[CPR]] on another officer and tried to run them over.<ref name="NY Times Standoff"/><ref name="DeWitt2013"/><ref name="AutoLC-66"/><ref name="AutoLC-67"/> Dzhokhar abandoned the car half a mile away and fled on foot.<ref name="NY Times Standoff"/><ref name="cnnpol"/><ref name="AutoSQ-1"/><ref name="AutoLC-71"/> Badly wounded, Tamerlan Tsarnaev was taken into custody and died at 1:35{{nbsp}}a.m. at [[Beth Israel Deaconess Medical Center]].<ref>{{Cite news|last=Bidgood|first=Jess|date=May 4, 2013|title=Autopsy Says Boston Bombing Suspect Died of Gunshot Wounds and Blunt Trauma|language=en-US|work=The New York Times|url=https://www.nytimes.com/2013/05/05/us/autopsy-says-boston-bombing-suspect-died-of-gunshot-wounds-and-blunt-trauma.html|access-date=September 7, 2020|issn=0362-4331}}</ref>

[[Massachusetts Bay Transportation Authority]] Police Officer Richard H. Donohue Jr.<ref name="AutoLC-28"/> was critically wounded in the leg<ref name="Auto9P-2"/> in crossfire from other officers shooting at the fleeing vehicle, but survived. Reports revealed that his gunshot wound severed his [[femoral artery]], and he nearly died. Fast-acting efforts by his fellow officers and medical personnel saved his life.<ref>{{cite news |date=April 15, 2014 |title=Donohue Talks Miracle Survival On Toucher & Rich: 'I Don't Have An Explanation For It' |url=http://boston.cbslocal.com/2014/04/15/dic-donohue-talks-miracle-survival-on-toucher-and-rich/ |newspaper=CBS Boston }}</ref> Boston Police Department officer Dennis Simmonds was injured by a hand grenade and died on April 10, 2014.<ref name=Simmonds/> Fifteen other officers were also injured.<ref name="captured" /> A later report by Harvard Kennedy School's Program on Crisis Leadership concluded that lack of coordination among police agencies had put the public at excessive risk during the shootout.<ref>{{cite news |last1=Schworm |first1=Peter |last2=Cramer |first2=Maria |date=April 30, 2013 |title=Harvard report praises response to Marathon bombings |url=https://www.bostonglobe.com/metro/2014/04/02/harvard-university-report-draws-lessons-from-marathon-bombings/qhXQcxi6jCxQqQnojtC3dP/story.html |newspaper=[[The Boston Globe]] }}</ref>

Only one firearm, Tsarnaev's Ruger P95, was recovered at the scene. That firearm was found to have a defaced serial number.<ref name="AutoLC-68"/><ref name="ABC24Apr">{{cite news | first1 = Jack | last1 = Date | first2 = Matthew |last2 = Mosk | title = Single Gun Recovered From Accused Bombers | date = April 24, 2013 | publisher = ABC News | url = https://abcnews.go.com/Blotter/single-gun-recovered-accused-boston-bombers/story?id=19028841 | work = ABC The Blotter | access-date = May 16, 2013}}</ref>