Investigators have received at least 600 tips about Christopher Dorner, the fugitive ex-police officer sought in a series of killings, officials said Monday.

Hundreds of investigators are continuing to follow up on the potential leads, Los Angeles Police Department Lt. Andy Neiman said at a morning media briefing in downtown Los Angeles. The tips are being prioritized based on the information they contain.

Neiman also stressed that the ongoing search at Big Bear, although scaled back, remains a "critical piece of the investigation," saying authorities would remain on the mountain "until we've looked in every nook and cranny."

Neiman said he does not know how much the multi-agency manhunt has cost so far, but described it as a "substantial cost to the city and taxpayers."

Read more at the LA Times