SAN BERNARDINO, CALIFORNIA (REUTERS) - A deposit of US$28,500 (S$40,077) was made to Syed Farook's bank account on Nov 18, some two weeks before he and his wife Tashfeen Malik went on a shooting rampage in San Bernardino, California, Fox News reported on Monday (Dec 7), citing a source close to the investigation.

Investigators were trying to determine whether the transaction, made from Utah-based WebBank.com, was a loan, Fox News said, citing the source.

The couple killed 14 people and wounded 21 others when they started shooting at a holiday lunch event on Dec 2.

On or around Nov 20, Farook withdrew US$10,000 of the money in cash and deposited it at a Union Bank branch in San Bernardino, according to the Fox News source, who also told the cable news network that in the days before the shooting, there were at least three transfers of US$5,000 each that appeared to be to Farook's mother.

Fox News quoted the source as saying the transactions appeared to represent a "significant source of premeditation".