The threat was the first Brandeis has received, Shreibman said. A Seventh-day Adventist school had received a similar call Tuesday.

Classes continued Tuesday at Brandeis, which didn't cancel a previously scheduled evening program. But overnight, school officials decided to call off Wednesday classes to inform parents and allow them to share their concerns.

Police conducted a second search Wednesday morning and again found nothing. School was expected to be open Thursday and Friday.Brandeis Hillel's other campus in San Rafael was put on a higher security alert, Shreibman said, but classes continued as usual.