Police officers conduct a manhunt after a mass shooting in San Bernardino, California December 2, 2015. (Mike Blake | Reuters)

The FBI announced Friday that it had taken the lead role in the investigation of the San Bernardino shooting, and that it would investigate the attack as an act of terrorism.

David Bowdich, from the FBI’s Los Angeles office, said in a Friday afternoon news conference that investigators had uncovered “telephonic connections” between the two shooters and other subjects