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During his second briefing on the Boston Marathon bombings, President Barack Obama says the FBI is investigating the crime as an act of terrorism.

“Any time bombs are used to target civilians, it is an act of terrorism,” Obama said, calling it a “heinous and cowardly act.”

Obama says he still has no idea who was behind the attack but urges Americans to speak up and alert authorities if they see anything suspicious.

At least three people were killed and over 170 injured in the attack.