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Sheriff's deputies shot a man they say had a gun but relatives are questioning the killing after video apparently showed them continuing to shoot as he crawled on the ground.

LYNWOOD, Calif. (AP) — Sheriff's deputies shot a man they say had a gun but relatives are questioning the killing after video apparently showed them continuing to shoot as he crawled on the ground.

The man, identified Sunday as Nicholas Robertson, 28, of Lynwood, died at the scene Saturday morning in the south Los Angeles suburb.

Two Los Angeles County sheriff's deputies were called out around 11 a.m. by reports of a man walking around and firing a gun into the air, Deputy Juanita Navarro-Suarez said in a statement.

Deputies spotted the man in front of a gas station and ordered him to drop the gun, but he refused, the statement said.

"Witnesses in the immediate area said they saw the suspect turn and point the gun at the deputies prior to the shooting," the statement said.

Video, apparently from a cellphone, appeared on several media sites. It appears to show the deputies firing some two dozen bullets, including several rounds after Robertson falls and is crawling on the ground.

"They shot him in his shoulder and he was crawling," Pamela Brown, his mother-in-law, told KCAL-TV.

"He left three kids behind, two daughters and a son. What, they could have Tasered him or anything."

Sheriff Jim McDonnell promised the investigation would be handled "with the utmost professionalism and integrity" and urged anyone with information to come forward.

"In this modern age of cellphone video and instant analysis on the Internet, I would ask that we keep in mind that a thorough and comprehensive investigation is detailed and time intensive," he said in a statement. "It will involve, not just one source of information, but numerous sources, potentially including multiple videos, physical evidence and eyewitness accounts."