The FBI has started searching a lake near the San Bernardino shooting site as investigators believe that the gunmen spent time there.
According to ABC News, the FBI has not discussed the specific evidence it was looking for, but said it was seeking "anything that had to do" with the shooting.
An official said that investigators are searching Seccombe Lake Park as a precaution, to ensure that no evidence was missed.
FBI Los Angeles branch Assistant Director David Bowdich said that it is a possibility that they end up finding nothing, adding that the search could take days.