An old artillery shell that shut down the area near San Francisco's AT&T Park Friday afternoon was determined to be harmless by munitions experts, a police spokesman said.
Construction crews at a site near 3rd and Mariposa streets apparently uncovered the shell while sifting through dirt and transported it several blocks north to Channel Street before notifying authorities, police spokesman Officer Carlos Manfredi said.
Once it was determined to be a possibly dangerous device, authorities closed off the 200 block of Channel Street -- located just across McCovey Cove from the ballpark -- at around 10:45 p.m.
The Police Department's bomb squad responded and determined the device was an old military-grade artillery shell. Police contacted Travis Air Force Base, which is sending technicians to determine the exact nature of the device, Manfredi said.
The incident has prompted street closures in the area and the evacuation of two nearby buildings, as well as residents living along the waterfront in houseboats, Manfredi said.
Crews remained at the scene until around 3 p.m., when it was determined that the shell was not live. The technicians from Travis planned to take the shell back to the Air Force base.
He said police want to discourage people from transporting a suspicious device that could be explosive.
"As a rule of thumb, if you see something that may go boom, stay away," he said.
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