Both.

Senior Corporal Jeremy Borchardt and others ultimately arrived at the idea to use a bomb disposal remote control vehicle armed with about 1 pound (0.45 kilograms) of C-4 explosive. The plan was to move the robot to a point against a wall facing Johnson and then detonate the explosives.[25][31][32][33][34][35] The device exploded as intended at approximately 2:30 a.m., killing Johnson immediately.[36] It was the first time that explosives strapped to a robot had been used in American domestic law enforcement.[27] Although its arm sustained damage in the blast, the robot was still functional.[37]