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The headquarters of satirical magazine Charlie Hebdo were attacked today in Paris in a clash that left at least 12 dead. The gunmen responsible, who fled from the scene, are still unidentified and at large. Homeland security expert Juliette Kayyem joined Boston Public Radio to explain how the search for those responsible will likely go forward.

"The important thing right now is to get these guys," Kayyem said.

"They are probably separated by now. Given European borders, they might even be in another country by now," she explained. "This is a continent-wide manhunt right now."

To locate them will likely take a multi-pronged approach. On one hand, the French equivalent of the F.B.I., the D.G.S.I., will investigate for hints or clues to suggest who the attackers may be or where they are now.

The site itself will also be scoured for ballistic evidence that can yield more information about the identity of the attackers. That includes the car the attackers abandoned in Rue deMeaux in northern Paris during the escape.

"No crime scene this big doesn't leave hints behind," Kayyem said.

To hear more from homeland security expert Juliette Kayyem, tune in her full interview on Boston Public Radio above.