Thousands of pupils were evacuated as four schools in the West Midlands received bomb scare calls. Students at Holly Lodge, Oldbury Academy and Bristnall Hall in Sandwell were evacuated and lessons at Leasowes High School in Halesowen were halted.
The schools received the threats between 09:00 GMT and 09:30, West Midlands Police said.
The force said all students were safe and an inquiry was under way to find out who was responsible for the calls.