Terrorism expert Paul Cruickshank says ‘it’s certainly possible that a lone wolf could have been responsible’ for Boston Marathon bombings

This morning on "Early Start" terrorism expert Paul Cruickshank weighs in on the twin explosions that occurred near the finish line of the Boston Marathon on Monday.

Cruickshank who is also a CNN contributor says "it’s certainly possible that a lone wolf could have been responsible" for Boston Marathon bombings. He adds that there is "a lot of concern right now that the suspect or suspects are still at large and there could be following attacks."