Authorities say the are baffled about the disappearance of a North County family earlier this month.
Joseph McStay, 40; his wife Summer, 43; and their two young children, Gianni and Joey Jr., were last seen Feb. 4.
"Quite frankly, I've never seen a case like this before," said San Diego County Sheriff's Lt. Dennis Brugos said.
The San Diego County Sheriff's Department said it had contacted a liaison in Baja California and asked for a search of airports, bus stations and other major travel hubs.
Brugos also said that when a family goes missing, the people are usually found either safe or victimized within a day or so. He added that since the case is so unusual, he is not sure how long the investigation will remain open.
The family has set up a Web site with information and pictures. Anyone with information about the case is being urged to call deputies at 858-974-2321 or 858-565-5200 after-hours. Tips can also be called in anonymously to CrimeStoppers at 888-580-TIPS(8477). A reward of up to $1,000 is being offered by CrimeStoppers for information leading to an arrest.