Mob beats San Francisco teen unconscious over soccer ball taunt

A 15-year-old boy in San Francisco was beaten unconscious by a group of 18 men after he spun a soccer ball in front of one of their faces, police said Monday.

The attack, which police are investigating as an aggravated assault, happened Friday about 10 p.m. on the sidewalk in the area of San Bruno and Silver avenues, next to the Highway 101 overpass, said Officer Carlos Manfredi, a spokesman for the San Francisco Police Department.

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After the teenager twirled the soccer ball, he got into some kind of argument with one of the men. Then the man and his comrades — all between the ages of 25 and 35 — began punching and kicking him, Manfredi said.

The teen lost consciousness, and paramedics transported him to a hospital with non-life-threatening injuries.

No arrests have been made.

Kimberly Veklerov is a San Francisco Chronicle staff writer. Email: kveklerov@sfchronicle.com Twitter: @kveklerov