SAN FRANCISCO (CBS SF) – A hand grenade found by a man with a metal detector shut down a portion of San Francisco’s Golden Gate Park for more than two hours Thursday afternoon, police said.

The discovery was reported at about 1:10 p.m. in the 1300 block of Martin Luther King Jr. Drive, near Mallard Lake, after the metal detector revealed the grenade’s presence, police said.

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Officers shut down the area to traffic and the department’s bomb squad responded. They rendered the grenade safe at about 3:30 p.m., police spokesman Sgt. Mike Andraychak said.

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Traffic was reopened in the park about five minutes later, he said.

No one was injured in the incident.

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