Recovery workers hiked though rugged terrain near the Mexican border Sunday to reach the remote site where a private jet went down after taking off from San Diego, killing all five people aboard. The Learjet was being used as an air ambulance when it crashed carrying two pilots, two paramedics and a nurse on a flight bound for Albuquerque, New Mexico. The plane went down around 12:30 a.m. Sunday in a mountainous region about 3 kilometers (2 miles) east of a small San Diego airstrip, said Larry Levy, CEO and medical director of Albuquerque-based Med Flight Air Ambulance, which owned the aircraft. It was the company's first crash since starting operations in 1979. Emergency personnel had to hike to the crash site. They had located three bodies by late morning, said Capt. Glenn Revell of the San Diego County Sheriff's Department. --More 0017 Local Time 2117 GMT