A total of 12 people were taken to hospitals Friday suffering from pain in the eyes and throat after an unknown liquid was sprayed at a pachinko parlor in Osaka, authorities said.

All those people taken to hospital remained conscious, according to rescue workers.

A man used a spray can to discharge the liquid after quarreling in the pachinko parlor in Nishinari Ward, police said. The man left the site.

One customer called police around 8:40 p.m. to raise the alarm.