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FBI divers are now scouring a San Bernardino lake for evidence that may have been left behind by terrorists Syed Farook and Tashfeen Malik.

Authorities have not specified what exactly they are looking for, but some believe it could be a hard drive or other electronic evidence.

Officials say there was a 4-hour window between the time the attackers left the scene of the holiday party and their later confrontation with police in a deadly gun battle.

In that time, Farook and Malik may have driven to the lake – situated about 2 miles away – and dumped some evidence, William Lejeunesse reported from San Bernardino.

The good news is that the manmade lake is relatively shallow, he said this morning.

“But this search could take several days.”

The attackers' shooting rampage in San Bernardino on Dec. 2 left 14 dead and 21 more injured.

“We will leave no stone unturned,” said FBI Asst. Director David Bowdich at a news conference yesterday.

Watch more of the live report, above.

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