America for the first time after many years has witnessed two serial bomb blasts on Monday. According to reports two powerful bomb blasts occurred within seconds at Copley Square, on the north side of Boylston Street, near Prudential Center in Boston city. Two people were killed on spot and more than 100 were injured in these twin blasts. The area becomes a war hit zone in minutes leaving several people profusely bleeding on the roads crying for help.According to reports, condition of 15 people injured in the blasts is very critical.

The bombs were planted targeting the Boston’s grand annual event of Marathon race in which around 23000 people were participated. The Boston Marathon race was held in honor of the victims of the Newtown, Conn., shooting in which 26 people died at Sandy Hook Elementary school few months ago.

So far, no terror group has come forward claiming responsibility for the blasts. But, US President Barack Obama has vowed that those responsible will "feel the full weight of justice." He asked the intelligence officials "Make no mistake: We will get to the bottom of this." Medical teams, police and intelligence teams have immediately rushed to the spot and starts rescue and investigation operations.