Michigan police agencies have received more than $40 million worth of surplus military equipment from the Defense Department, records show.

Police agencies across the state say the need military-grade weapons and criminals to deal with violent criminals. A report from the Detroit Free Press said Monday police agencies across the state received $43 million worth of surplus equipment from the Pentagon since 2006. 

The use of military equipment has come under close scrutiny in the midst of ongoing protests in Missouri over the fatal shooting of 18-year-old Michael Brown.

The newspaper relays several accounts of accidental deaths associated with the use of military-grade equipment in police raids in the Detroit area. 

Rights group Amnesty International said Monday it was calling for a probe into police use of force during the Ferguson riots.

Federal officials didn't reveal to the Detroit newspaper which agencies received the surplus equipment.