Police say they found a dozen pipe bombs and thousand of rounds of ammunition at the home of the couple suspected of Wedneday's mass shooting in southern California.
San Bernardino Police Chief Jarrod Burguan said a search of Syed Rizwan Farook and Tashfeen Malik's house in Redlands, California, also found tools that could be used to construct improvised explosive devices.
He said the couple had sprayed between 65 and 75 rounds on Wednesday morning at a social services centre in San Bernardino, killing 14 people and injuring 21 others.
Chief Burguan said the suspects fired another 76 rounds at police who pursued them in a car chase following the massacre.
They left at the scene of the massacre three pipe bombs which were designed to be operated by a toy car remote control but didn't work, said the police chief.
The suspects proceeded to fire another 76 rounds at police who pursued them in a car chase following the massacre.
David Bowdich, assistant director of FBI Los Angeles office, would not comment explicitly on reports that Farook had been radicalised.
He told reporters: "There was obviously a mission here. We do not know why."
