Authorities confirmed three unexploded Molotov cocktails were found inside a locker at CA Frost Middle High School.
Grand Rapids Police Sergeant Cathy Williams said school staff removed the petrol bombs from the locker of a student who was absent from school today.
The discovery prompted authorities to evacuate the 300 students on the premises while the bomb squad work to clear the scene.
There are no reports of any injuries.
Molotov cocktails are a crude incendiary device typically consisting of a bottle filled with flammable liquid and with a means of ignition.
The entire country is on high alert after one of the deadliest school shootings in US history claimed the lives of 17 people in a Florida school yesterday.
Nikolas Cruz, 19, has been charged with 17 counts of premeditated murder after he walked into the Marjory Stoneman Douglas High School in Parkland and opened fire on students and teachers.
More to follow…