The Clarkstown Police Department gave the all clear at Clarkstown South High School Thursday after they investigated a bomb threat. 

The threat came to the school through a phone call to the principal around 3 p.m. School had already ended but there were still some students left in the building.

The school was temporarily evacuated as officials investigated the threat.

The K9 unit did a full sweep of the school and according to the school's Facebook page, the police determined the threat was not credible.

The school says it will be open for class on Friday.