A Jewish day school in North Miami Beach was evacuated following a bomb threat.

The Yeshiva Toras Chaim Toras Emes school, which has enrolled 600 students from early childhood to high school, received a fax on Sunday demanding $25,000 in ransom and threatening to detonate explosives already in place at the school if the demand was not met, WSVN News 7 reported late Sunday.

The message warned school officials not to call police, saying if they do so “I’ll know.” The letter also said that the would-be bomber had access to the school’s computers and email addresses, according to The Yeshiva World news website. The letter demanded that the money be sent to a certain address in the United States via Western Union by May 31.

Get The Times of Israel's Daily Edition by email and never miss our top stories Free Sign Up

Roads near the school campus were shut down and bomb-sniffing dogs searched the area. No bombs were found.