U.S. authorities have shot and killed the driver of a vehicle at an entry point along the U.S.-Mexico border.

The shooting occurred Thursday near the busy San Ysidro Port of Entry, which links the northern Mexican city of Tijuana with the southern California city of San Diego.

Border security officials are reported to have been following the vehicle on suspicion that illegal immigrants were being smuggled into the United States. At least four people in the vehicle were detained after the shooting.

Authorities shut down the border crossing for several hours after the shooting, causing a huge traffic jam.

Some information for this report was provided by AP and Reuters.