A wildfire that blackened about 50 acres in the bed of the San Luis Rey River and damaged a single structure was about 20 percent contained Wednesday night.

The blaze erupted east of College Boulevard in Oceanside in the early afternoon, according to fire department officials.

Police evacuated residences on Andrew Jackson Street and surrounding streets and closed some traffic lanes while firefighters doused the flames.

As of about 7:45 p.m., fire crews had the blaze confined to the riverbed, according to city officials.

No injuries were reported. The cause of the fire was under investigation.

— City News Service

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Chris Jennewein is founder and senior editor of Times of San Diego.