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Continuing unrest over gasoline price hikes in Mexico flared up at the Tijuana border crossing Saturday night as a large protest prompted U.S. authorities to block access into Mexico from San Ysidro for nearly four hours.

Southbound Interstates 5 and 805 began to reopen to motorists wanting to cross the border about 9:15 p.m., according to the California Highway Patrol.

The demonstration at Tijuana’s El Chaparral port of entry was among several held throughout Mexico Saturday — including a protest that turned violent outside a Rosarito Beach gasoline distribution center.

U.S. Customs and Border Protection officials and the California Highway Patrol began diverting southbound I-5 and I-805 traffic about 5:30 p.m. “to support the government of Mexico’s inbound (vehicle inspection) operation,” said Customs spokesman Ralph DeSio.

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