By DOUGLAS MOSER
---- — BOSTON — State and federal officials said there "are no known additional threats" as federal investigators took the lead in getting to the bottom of yesterday's bombing.
Investigators and officials said they have no one in custody as of this morning, though interviews of "a variety of witnesses in a variety of places" will continue and residents should expect an elevated police presence in the city. Gov. Deval Patrick stressed that investigators knew of only two explosive devices involved in yesterday's bombing at the Boston Marathon finish line on Boylston Street. "All others parcels in the area of the blast have been examined, but there were no unexploded bombs," he said. Boston Police Commissioner Ed Davis put the total casualty count at 176 people, with 17 of those people critically injured and three dead.
The FBI, the Bureau of Alcohol, Tobacco, Firearms and Explosives and US Immigration and Customs Enforcement are all working on the investigation, which includes the heart of the Back Bay around Copley Square and the Prudential Center on Boylston Street.
Rick DesLauriers, special agent in charge of the FBI field office in Boston, said his agents, along with ICE agents, were "investigating a variety of witnesses in a variety of places," but would not give specifics about reports of agents questioning people at an apartment building in Revere last night.
He and Gene Marquez, special agent in charge of the ATF Boston field office, said the investigation is active and ongoing.
Boylston Street is still closed for several blocks near the site of the blast, and police have barricades on Newbury Street and St. James Street. The National Guard, Massachusetts State Police, Boston Police and the MBTA police have a heavy presence at subway and commuter rail stations, especially at T stops near Copley Square.
"This scene is going to take several days to process," Marquez said.
But Davis said people can still come and go in the area. "We want you to live your lives," he said. "We want you to be vigilant."
Police urged residents with any information or with images or video of the scene just before or just after the explosions to call either the Boston hotline at 617-635-4500 or the FBI hotline at 1-800-CALL-FBI.