Yes, it's terrorism, White House concedes

The bombing at the Boston Marathon that killed at least two and injured more than 80 is believed to be an act of terrorism, a senior White House official says.  The timing of the blasts immediately sparked suspicions of a deliberate act.  “When multiple devices go off, that’s an act of terrorism,” a senior administration official  said  moments after President Obama delivered a statement to the nation that avoided the word “terror.” More