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The Los Angeles County sheriff's department has launched an investigation after two deputies were seen using force to detain two people at a grocery store last month in a "disturbing" video.

Deputies responded to a report of a robbery in progress at a grocery store in Lancaster in northern Los Angeles County on June 24 and tried to detain a man and a woman police said matched the description given by store security personnel, the sheriff's department said in a statement Monday. The encounter then "escalated into a use of force incident," the department said. The incident was captured on body camera and cellphone video.