The Anti-Defamation League in San Francisco was evacuated Monday afternoon due to a bomb threat, but police declared the building safe about two hours later after a thorough search.

Police responded to the scene about 4:30 p.m. They later brought in bomb-sniffing dogs to investigate the premises at 720 Market St.

By about 6:40 p.m., police declared the building and surrounding areas clear.

The bomb threat was made to a staff person answering calls about 4:15 p.m., according to a statement released by ADL's CEO Jonathan Greenblatt. It was the latest in a series of nearly two dozen threats fielded by local Jewish institutions across the country Monday, and it was the second bomb call threat received at an ADL office in the past week, the statement said.

Also Monday evening, the Oshman Family Jewish Community Center in Palo Alto received a threatening phone call and evacuated its building, according to tweets by the center at about 5:30 p.m.

The center, located at 3921 Fabian Way, canceled all remaining classes Monday and was working with Palo Alto police to investigate the threat.

Police said about 7:30 p.m. nothing was found during their search, and the center was cleared.