The first riot occurred on August 1, 1961, when an elderly day laborer from Kamagasaki was killed in a traffic accident. The official who arrived on the scene assumed that the man was already dead (only doctors are allowed to pronounce a death) and left the body on the street for over 20 minutes without calling an ambulance while he spoke with witnesses. A large group of day laborers surrounded the Nishinari police station in protest of the man's treatment, overturned parked police cars, and set fire to nearby apartment buildings. The Osaka Prefectural Police responded with 6,000 officers, using police sticks and vehicles to round up the rioters. It took two days to stop the 2,000 rioters; 28 were arrested. Approximately 10 rioters and 100 police officers were injured.