Updated 1:15 p.m.

A U.S. Customs and Border Protection agent at the Otay Mesa crossing shot at a suspected carjacker Saturday, prompting authorities to temporarily close the busy crossing to southbound passenger vehicles.

Caltrans reported at about 1 p.m. – about four hours after the incident began – that the point of entry had re-opened.

The shooting came minutes after a man allegedly got into a gray Toyota Tacoma in central San Ysidro, in the , near East San Ysidro Boulevard, according to San Diego police.

The woman who had been driving the pickup truck was dragged a short distance and sustained minor leg injuries. Her 7-year-old son was apparently able to escape.

The vehicle was apparently driven five miles east to the Otay Mesa border gate, where the agent fired at the pickup truck at about 9:15 a.m. as it reached the crossing without stopping.

It was unclear if the driver was struck, police said.

The southbound Otay Mesa auto route into Baja California was closed to vehicles by 9:30 a.m., but the truck scales and crossing into Mexico remained open, according to Caltrans. CBP officials said via Twitter that southbound pedestrian entry also was available; northbound inspection gates were open too.

Northbound inspection gates were open, and there were no restrictions at the San Ysidro or Otay East crossings.

The incident was not apparently connected to Friday’s kidnapping and Amber Alert, police said.

– City News Service