Boston lived through a night of terror as police chased two individuals believed to be behind Monday's Boston Marathon bombings across the city.
The pair shot and killed an MIT campus police officer and left another transportation police official gravely wounded, according to a Middlesex County DA release.
Here are some images from the night.
An shot from the MIT crime scene was posted to Twitter by the school's student newspaper:
Soon after (or before according to other reports) "Suspect 2" allegedly attempted to rob a convenience store, as captured in this image:
Next the suspects apparently hijacked a Mercedes SUV at gunpoint. The driver was held in the car but eventually dropped off unhurt, according to the DA.
But it led to a cross-town police pursuit from Cambridge into Watertown. There was gunfire and explosions, thought to be from improvised explosive devices.
Suspect 1 was killed in the police standoff, though the DA does not specify when this occured.
Here are images from the pre-dawn crime scene in Watertown:
AP Photo/Matt Rourke
Police officers walk near a crime scene Friday, April 19, 2013, in Watertown, Mass.
Police officers keep their rifles trained on a man they've ordered to the ground.
AP Photo/Matt Rourke
Police officers aim their weapons Friday, April 19, 2013, in Watertown, Mass.
Heavily armed police offers arrive on the scene of the manhunt.
A man is ordered to the ground by police. It is unclear whether he was later released.
Law enforcement officials stage in a parking lot during a search for the two men suspected of setting off two explosions during the Boston Marathon in Watertown, Massachusetts, April 19, 2013.
A law enforcement official checks his rifle during the police search.
Hospital officials who treated Suspect 1 suggested he may have been wearing an explosive device, although they would not confirm this.
Suspect 2 managed to escape.
Here are images from the scene there:
The scene at School and Walnut streets:
Darren McCollester/Getty Images
Military Police arrive in armoured vehicles at the parking lot of the Arsenal Mall:
Jared Wickerham/Getty Images
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