Update: 5:25 p.m. Tuesday. President Obama will visit Boston on Thursday and will participate in an interfaith memorial service, according to Massachusetts Gov. Deval Patrick.
Additionally, the governor and Boston Mayor Thomas Menino announced the creation of OneFundBoston.org, a website where people can make contributions to help those most affected by the bombings.
Update: 1:05 p.m. Tuesday. NBC News is reporting that the two explosive devices used in the Boston Marathon bombing were "shrapnel-studded pressure cookers" and carried to the scene in backpacks.
The bombs were set off with timers, according to NBC quoting law enforcement officials.
Additionally, the FBI is urging anyone with photographs or videos from the scene to share those with the bureau.
Original story: WASHINGTON, D.C. — The FBI is investigating Monday's Boston Marathon bombings as a terrorist attack though "we don't have a sense of motive yet," President Barack Obama said in a short news briefing broadcast around 11:30 a.m. Monday.
"Any time bombs are used to target innocent civilians, it is an act of terror," Obama said. "What we don't yet know, however, is who carried out this attack or why, whether it was planned and executed by a terrorist organization, foreign or domestic, or was the act of a malevolent individual."
All law enforcement resources have been mobilized to investigate the attacks that killed three people and injured more than 170, Obama said.
"The American people refused to be terrorized, because what the world saw yesterday in the aftermath of the explosions were stories of heroism and kindness, generosity and love," Obama said. He mentioned runners who gave blood after the race, first responders who ran toward the explosions to help and the medical staff still treating the wounded in Boston's hospitals.
In Connecticut, Gov. Dannel Malloy has ordered all flags at half-staff.
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