Police are investigating after they received a text saying there was an active shooter at a Portland school Monday morning.

Casco Bay High School was evacuated after the text was received by dispatchers around 9:20 a.m.

The school district says police escorted students on their evacuation route towards Lyman Moore Middle School.

Officers searched the building but found no threats inside. Police gave the all-clear to reopen the school around 11:00 a.m.

The school on Allen Ave. shares its building with Portland Arts and Technology High School.

Portland police say anyone with information about the threat is asked to call (207) 874-8575.