Taoyuan, May 21 (CNA) A police officer in Taoyuan's Zhongli District is being investigated on suspicion of assault for striking a man who rampaged through a convenience store on Saturday 10 times with his baton after the man had been subdued.

The Taoyuan Police Department's Zhongli Precinct said in a statement that the officer, surnamed Wang (王), appeared to have lost control of his emotions and used excessive force in response to the man's verbal "provocations."

The incident began when 28-year-old amateur bodybuilder, surnamed Chu (朱), entered a 7-Eleven store shirtless and began acting erratically, talking to himself and turning over product displays, prompting the store's clerk to call the police.

When police arrived at the store and asked Chu to leave, he became even more enraged, striking both officers in the face in turn as they tried to disable him with pepper spray, the precinct said.