"Boston Marathon Bombing: Police Say Terrorism Attack"

The Braintree police is reporting that the bombs detonated at the Boston Marathon are likely to be the result of a terrorist attack.  According to the official Twitter account of the Braintree Massachussets police, the scene in Boston is completely chaotic. Around 3:15 they tweeted:

"Explosion at finish. Walking with group. Complete Choas. Possible terrorist attack. 2 explo. 671 Boylston St outside the Boston Public Library-Large crime scene being established-MCI being declared. Numerous serious injuries." 

Less than half an hour later at 3:43, the police reported two other explosions at the Boston Public Library:

"2 explo. 671 Boylston St outside the Boston Public Library-Large crime scene being established-MCI being declared. Numerous serious injuries"

Joe Biden has called the incident a "bombing."