(Mesa, AZ) -- Three members of the Mesa Police Department injured after a gun accidentally fires. It happened last night near Ellsworth and Brown roads when police were processing a crime scene. A crime scene technician was handing a weapon as evidence when it discharged. Police say the bullet went through his hand, grazed an officer's abdomen before striking his forearm. Another officer was hit in the face with shrapnel. The tech is undergoing surgery, but all three are expected to be okay.