Terrorists attack at Boston Marathon killed 3 while several injured

Washington: White House has called Boston bombing an “Act of terror”, reports Dispatch News Desk (DND) wire news agency.

It was the worst bombing on U.S. soil since security was tightened after the attacks of September 11, 2001, and President Barack Obama promised to hunt down whoever was responsible for the attack on a day when tens of thousands of spectators packed the streets to watch the world-famous race.

No one has been arrested and the White House official said it would have to be determined whether the attack came from a foreign or domestic source.