A man with a revolver robbed a Mission Viejo Del Taco on the morning of Christmas Eve, officials said.
The Orange County Sheriff's Department received the call at 5:08 a.m. Monday from the restaurant on the 24400 block of Alicia Parkway, said Lt. Jim England.
The suspect obtained an undisclosed amount of cash from the server behind the counter and fled on foot.
No one was injured and, as of Wednesday morning, no arrest had been made, England said.
Anyone with information should report it through OC Crimestoppers, 1-855-TIP-OCCS.