"Everyone was just in utter shock and looking around."
"It is a criminal investigation that is … a potential terrorist investigation," FBI special agent Rick DesLauriers said in a news conference.
President Barack Obama vowed on Monday that the United States will find out who carried out explosions in Boston and will hold them accountable, and a White House official said the twin blasts are being treated as an "act of terror,"
White House official said any event with multiple explosive devices, as the Boston episode appeared to be,
"is clearly an act of terror, and will be approached as an act of terror."
"However, we don't yet know who carried out this attack, and a thorough investigation will have to determine whether it was planned and carried out by a terrorist group, foreign or domestic," the official said.
Explosion took place
Boston police said the explosions occurred near the finish line — about 45 to 90 metres apart — that resulted in 'multiple