Boston police on bicycles patrol on Commonwealth Avenue following explosions near finish line of the BOSTON Marathon
BOSTON -- WBZ-TV in Boston is reporting that law enforcement officers are searching an apartment in the Boston suburb of Revere, following Monday's attack at the Boston Marathon.
Massachusetts State Police will only say that a search warrant related to the investigation has been served in Revere.
As the FBI takes charge of the investigation, authorities have shed no light on a motive or who may have carried out the bombings.
WH Official: bombing 'act of terrorism'
A White House official says the bomb attack at the Boston Marathon that killed at least three people and injured more than 140 is being treated as an act of terrorism.
President Barack Obama says those responsible will "feel the full weight of justice."
Two bombs went off Monday and officials say as many as two unexploded bombs were also found near the marathon course, but they were safely disarmed.
More than 140 hurt in bombings
Boston hospitals are reporting at least 144 people wounded in Monday's bomb blasts at the Boston Marathon. At least 17 of those injuries are critical.
Roupen Bastajian, a Rhode Island state trooper, had just finished running the race when he heard the blasts. He says, "At least 25 to 30 people have at least one leg missing, or an ankle missing, or two legs missing."
Witnesses describe aftermath of bomb explosions at marathon
Spectator Brighid Wall says she was a few feet from the second bomb that went off at the Boston Marathon.
The 35-year-old woman from Duxbury, Mass., says when the blast went off, runners and other spectators froze, and then her husband threw their children to the ground and lay on top of them.
Wall says as she and her family left the scene, they saw injured people covered in blood and the windows of buildings blown out.