SAN FRANCISCO -- A hand grenade found by man using a metal detector to hunt for valuable relics has been removed from Golden Gate Park, police said.

The bomb squad investigated and gave the all-clear at 3:35 p.m., said San Francisco Police spokesman Sgt. Michael Andraychak. Further details were not released.

Police were called to the 1300 block of Martin Luther King Jr. Drive, near Mallard Lake, about 1:10 p.m. after the man found the device. He did not know if the grenade was live or not, and called police.

No one was injured.

The area around the grenade was closed to the public during the investigation.

Reach Kristin J. Bender at kbender@bayareanewsgroup.com. Follow her at Twitter.com/kjbender.