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UPDATE 8:47 p.m.: Emergency personnel are relaxing, shaking hands, and leaving the scene.
UPDATE 8:44 p.m.: Suspect 2 is "in custody," according to numerous live broadcasts.
UPDATE 8:36 p.m.:
— Paula Ebben (@PaulaEbbenWBZ) April 20, 2013
UPDATE 8:34 p.m.:
— Jennifer McDonald (@CJGren) April 20, 2013
UPDATE 8:11 p.m.: New helicopter arriving, shining very bright light. Robot on-scene.
UPDATE 7:57 p.m.: Reports of "no further movement" in the boat. State helicopter no longer hovering above the scene.
UPDATE: 7:50 p.m.: Several more "pops" heard, via multiple live broadcasts. Audible. Darkness is falling. Media vehicles asked to turn off their headlights. State police helicopter hovering overhead.
UPDATE: 7:47 p.m.:
— Brian Farnkoff (@BrianFarnkoff) April 19, 2013
UPDATE: 7:45 p.m.:
Suspect 2 can be seen moving in the boat by a Mass. State Police infrared scanner WATCH LIVE - bit.ly/12kdw32
— FOX 25 News Boston (@fox25news) April 19, 2013
UPDATE 7:39 p.m.:
Unconfirmed? @bostondotcom Police have taken cover off boat containing the man believed to be the Marathon bombing suspect. He's not moving.
— Sarah Green (@skgreen) April 19, 2013
UPDATE 7:29 p.m.: Fox reporting suspect is "alive and surrounded."
UPDATE: Fox reporting Suspect 2 is down. Bomb robots arriving, presumably as a precaution because the suspects were known to wire themselves with bombs.
Original story below
— WCVB-TV Boston (@WCVB) April 19, 2013
At 7 p.m. EST, WCVB is reporting that rapid gunfire ("a couple dozen" shots) and several "massive" explosions have been heard in Watertown, as officers surround a boat in a backyard that reportedly contained a bleeding person. All indications are that this is Boston Bomber Suspect 2, 19-year-old Dzhokhar Tsarnaev.
The address is 67 Franklin Street.
There was previously scanner chatter about using "gas."
Large SWAT vehicles, presumably filled with personnel, have arrived. Live television reports say the suspect is moving, and snipers are dialed in.
It's believed that Suspect 2 was injured during the previous night's firefight with police and has been operating in a wounded state since cops last saw him, when he drove a car over his bullet-riddled brother to escape police.
— David Portnoy (@stoolpresidente) April 19, 2013
Again shots fired near met auburn. About 30 cops and press cheering
— Aaron Spagnolo (@aaronspagnolo) April 19, 2013