sfpd_squad.jpgA man was critically injured when he was hit in the head with a bike lock in San Francisco’s Fillmore District early this morning, police said.

The attack was reported at 2:42 a.m. at Fillmore Street and Geary Boulevard.

A 21-year-old man, whose name was not immediately available, was arrested for the assault, which sent the 50-year-old victim to the hospital with life-threatening injuries, police said.

Anyone with information about the case is asked to call the Police Department’s anonymous tip line at (415) 575-4444 or to send a tip by text message to TIP411.

Dan McMenamin, Bay City News

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