GILROY (CBS SF) — A stretch of southbound U.S. Highway 101 in Gilroy was temporarily closed late Monday morning because of police activity.

The California Highway Patrol said southbound 101 lanes were blocked just south of Masten Ave. At 12:10 p.m., the CHP said lanes 1 and 2 had been reopened but lane 3 was still shut down.

By 12:23 p.m. all lanes had been reopened, the CHP said.

There was no immediate word on the nature of the police activity.