Shortly after police lifted the order to stay at home early Friday evening, Franklin Street homeowner David Henneberry ventured outside his house. He noticed something suspicious about the tarp on the boat docked in his yard and drew closer for inspection.
"He saw some blood and a body lying down," said neighbor Joe Morrissey. "He told me he jumped up, dialed 911 and there was a cavalcade of police."
Deveaux, whose force withstood a barrage of gunfire and explosions lobbed by the brothers, lauded residents minutes after the younger Tsarnaev's capture, saying "we asked you to remain vigilant and you did."
In his interview with CNN, Deveaux said police responded promptly to Henneberry's call. They shut down the street and evacuated several homes. After an initial exchange of gunfire with Tsarnaev, they assaulted him with explosives known as flash bangs, meant to disorient, and a negotiator on the second floor of the house began talking to him.
Deveaux said police were worried that Tsarnaev was wearing an explosive vest — as his brother had been the night before. It took the negotiator 20 to 30 minutes to persuade the 19-year-old to lift his shirt so that authorities could see his chest.
"Once we saw that, we felt comfortable enough to send some officers with tactical equipment to go in and grab him and pull him away from the boat so he wouldn't be able to have anything," Deveaux said in the CNN interview.
He noted that as police were talking with Tsarnaev, a hovering state police helicopter was keeping tabs on the wounded man with a heat seeking device that could detect every movement.
It was the Watertown's second round with Dzhokhar Tsarnaev. The first came when he and his brother, who had allegedly shot and killed a Massachusetts Institute of Technology campus police officer, careened into the sleepy streets of Watertown in two vehicles, including an SUV that they had carjacked.
Watertown police were able to track that car, Deveaux said, and knew what streets it was on because the carjacking victim's cell phone was still in the vehicle. They knew they were tracking the Boston Marathon bombing suspects because they had bragged about their role to the carjacking victim, Deveaux said: "We did the Boston Marathon bombing and we killed a police officer," the chief said the victim had quoted them as saying.
Deveaux said a Watertown officer on duty spotted the two cars at about 12:30 a.m. and called for backup. But before other officers could arrive, the brothers jumped out of the cars and opened fired. "They came out shooting," Deveaux said.
The police officer, still the sole responder, reversed his car to give himself some distance from the gunfire, as several more officers pulled up.
Deveaux said a shift had just ended and two off-duty officers on their way home responded to the call. Altogether, six police officers engaged in the gunfight, Deveaux said, estimating that there were more than 200 shots fired over five to 10 minutes, in addition to an uncounted number of pipe bombs and other explosives that the two men were lighting and throwing.
One of those explosives was a pressure cooker bomb similar to the ones used in the marathon bombs; Deveaux said its remains were found embedded in a car down the street. Two devices that didn't explode were also found, he said.
He said the gunfight was largely over by the time "the whole greater Boston area" was arriving to help, though one of the earliest to arrive, a Metropolitan Boston Transit Authority officer, was seriously wounded.
With Dzhokhar Tsarnaev under arrest — he remained in serious condition Saturday — investigators were still left to piece together the events that had left four people dead in five days of carnage — three killed by the two bombs that exploded along the marathon's route on Monday and MIT officer Sean Collier, shot dead Thursday night.
Fifty-three people injured in Monday's bombing were still in the hospital, three in serious condition, and the MBTA officer wounded in the shootout remained hospitalized.
Deveaux said his department has three cruisers "that will never drive again that are shot up. There's a lot of damage."
And as investigators piece together what prompted the brothers to target the marathon, they are also looking at how they got the weapons, Deveaux said.
"We have to figure that out," he said. "We have to find out more about this. And we will as the days go on."
On Franklin Street, too, they sought answers. Joy Arcolano missed the marathon for one of the first times in a decade on Monday because she and her husband wanted to seed the front lawn at their Franklin Street home. On Friday, they huddled at home as helicopters hovered and police exchanged gunfire with a fugitive.
"There's all these things you're supposed to do in a suburb," she said, standing on her porch Saturday morning. "Not crouching down in a spare bedroom waiting for the gunfire to be over."
But Arcolano said they'll be back at next year's race — held every year on a state holiday known as Patriot's Day.
"We're determined to keep it as the awesome special day it is," she said.
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