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A U.S. citizen traveling with his three stepchildren was arrested at a U.S. Border Patrol checkpoint near Salton City after agents found more than 50 pounds of cocaine in his car, federal authorities said Monday.

The unidentified 21-year-old man was stopped about 4:30 p.m. Feb. 3 at a checkpoint on Highway 86, near the southwest shore of the Salton Sea, according to a news release from U.S. Customs and Border Protection.

A K-9 with the agency alerted to the 2010 black Toyota Camry, and the car was sent on to a secondary inspection, where agents found hidden compartments in the vehicle’s floor.

Twenty-four wrapped packages of cocaine weighing nearly 57 pounds were found in the compartments. The drugs had a street value of about $678,000, the Border Patrol said.

The driver was arrested on suspicion of smuggling cocaine, and the drugs were turned over to the U.S. Drug Enforcement Administration.

The stepchildren — ages 10, 7 and 6 — were put into the custody of Imperial County’s child protective services agency.

Agents with the Border Patrol’s Imperial Valley-based El Centro Sector have seized more than 320 pounds in cocaine since Oct. 1, 2016, when federal fiscal year 2017 began, the release stated.

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