A male construction worker apparently died when a trench collapsed around him Friday morning in Daly City, North County Fire Authority officials said.
The man, whose name has not been released, was found trapped by dirt and debris after rescue personnel arrived at 1 Martin St.
Crews had responded at 11:20 a.m. and tried to treat the victim but they determined he had died.
Fire officials said the accident appears to have occurred while workers were grading a 12-foot deep trench to put in a 24-inch concrete drainpipe for a new housing development.
Two urban search and rescue crews were called in to extricate the victim because of the instability of the trench and surrounding ground. Fire officials said crews spent about 12 hours completing the extrication.
The California Division of Occupational Safety and Health is investigating the accident.