Police have cornered a man believed to be the second suspect in the Boston Marathon bombings in Watertown.

Shots were heard in the area by several correspondents, including CNN’s Drew Griffin and ABC’s Linsey Davis, around 7pmET. On CNN, Griffin recounted what he had heard for Wolf Blitzer.”I just heard what sounded like multiple assault rifle shots to me. Rapidly fired, and then all of a sudden it stopped,” Griffin said.

Shortly after Griffin’s report, the CNN video feed focused on a shot of the media stand-up locations in Watertown that showed NBC’s Lester Holt readying for a live shot (pictured right).

In addition to the coverage on the cable networks, which has continued throughout the day, all three broadcast networks are on the air with special reports that have extended through the evening newscasts.

Around 7:15pmET, NBC dipped into the feed from New England Cable News and a reporter could clearly be heard saying, “we don’t know shit.”

“Well that was a fortuitous time to dip into New England Cable News. We apologize for the language we inadvertently aired during what was a mix-up of communications on their part,” Brian Williams said immediately.

And it may be a long night: around 7:45pmET, Williams read an email from a law enforcement source on the air that said “Believe it’s him. Slow going here.”  Stay tuned.

More, 8:33 p.m.: On ABC News, Diane Sawyer talked to a resident of the neighborhood who is a friend of the man that tipped the FBI to the suspect’s location in the boat. “He looked up and noticed something was off about his boat, so he got his ladder, and he put his ladder up on the side of the boat and climbed up, and then he saw blood on it, and he thought he saw what was a body,” he said.

More, 8:42p.m.: NBC News is broadcasting WHDH’s special coverage. The NBC affiliate is reporting that the suspect has been taken into custody alive. NBC confirms; ABC News, CBS News follow minutes later.

On cable, Fox News and MSNBC reported the suspect’s arrest at 8:42 p.m., followed by CNN at 8:45 p.m.

By 10:05 President Obama appeared in the briefing room grieving those lost and thanking the people of Boston and first responders. Also, a message for the media — both social and traditional: “In this age of instant reporting, tweets, and blogs, there’s a temptation to latch on to any bit of information, sometimes to jump to conclusions. But when a tragedy like this happens with public safety at risk and the stakes so high, it’s important that we do this right. That’s why we have investigations. That’s why we relentlessly gather the facts.”

All the broadcast networks are in continuing coverage. “20/20″ on ABC, “Rock Center” on NBC and a special report on CBS. At 10:48pm, CBS News airs the first picture of the suspect, Dzhokhar Tsarnaev on the ground, getting medical care. “The police commissioner believes that he was shot in the firefight last night and had apparently been bleeding for 20 hours before he was found in the boat,” said Scott Pelley.

All three evening newscasts were expanded Monday after a pair of explosions killed at least two people at the finish line of the Boston Marathon.

The newscasts began shortly after President Obama addressed the nation from the White House press briefing room at 6:10pmET. NBC’s Brian Williams, ABC’s Diane Sawyer and CBS’ Scott Pelley had been anchoring coverage on their respective networks since the news broke shortly after 3pmET. ABC News and NBC News took brief breaks from their respective special reports just before the official start of the evening newscasts at 6:30pmET.

CBS News had Terrell Brown reporting from the scene and Don Dahler reporting from Massachusetts General Hospital. At the beginning of “Evening News,” correspondent John Miller took a few minutes to “clarify all these reports we’re seeing about a suspect in the media.” Saying he wanted to “proceed very carefully from here on out,” Miller reported that the person who was detained is a Saudi national who was seen running from the scene. “That may mean a lot, that may mean nothing at all,” Miller cautioned, noting that many people were running away from the blasts.

On NBC News, Williams was joined by Katy Tur in Boston, Chuck Todd from Washington D.C. and Pete Williams on the Boston police investigation. Williams interviewed an eyewitness, Serdar Ozturk, who saw the explosion from the finish line. “People’s faces instantly changed from smile to tears, and fear,” he told Williams. “People started running for their lives.”

ABC News had reports from senior national correspondent Jim Avila, senior Justice correspondent Pierre Thomas and Linsey Davis from the scene. Sawyer also checked in with Alex Perez in Chicago and Cecelia Vega in Los Angeles about security precautions in place in those two cities. “World News” ended with a montage of still photos from the scene. “We thank you so much for watching tonight,” Sawyer said. “Boston, as you know, is one of America’s great cities, filled with resilience and spirit. So on this day, when something terrible happened, we wanted to remind you of all those who rushed to help.”

All three networks have more extended coverage planned. Williams will anchor a special report at 10pmET on NBC, Terry Moran will anchor “Nightline” live at 12:35amET on ABC, and Pelley remained on the air with “Evening News” through 8pmET.

TV news organizations are gearing up for covering Sandy. There is still lots of uncertainty  but here is what we know so far. We will update this story as we get more information.

Cable:

The Weather Channel not surprisingly, has a slew of coverage planned. “Wake Up With Al” will air this weekend starting at 5:30 AM, and 5 AM starting next week.

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ABC News has made a number of changes to its correspondent assignments, both domestically and abroad.

Some of the more notable moves:

Jeffrey Kofman will move to ABC’s London bureau, he had been based in Miami. Kofman was front and center during two of 2010′s biggest news stories: the Chilean miner rescue and the BP oil spill.

Matt Gutman, whose reporting for ABC News Radio during the BP oil spill drew praise from executives, will now be a correspondent for all ABC News broadcasts and platforms, and will be based out of Miami. Gutman is currently in Haiti reporting on the cholera outbreak there.

Jim Sciutto will return to Washington from London, where he has served as senior foreign correspondent since 2002.

A number of other moves, after the jump.

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On the same day we learned three longtime ABC News correspondents are out the door, ABC News president David Westin has announced three newcomers.

Jeremy Hubbard, T.J. Winick, and Linsey Davis are joining NewsOne, the service ABC News provides to affiliates. Says Westin: “Our affiliates across the country and around the globe will benefit from the extensive reporting experience that Jeremy, T.J., and Linsey bring to their new assignments.”

Click continued to read where they’ll be working…

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