Police have opened up investigation papers on allegations that their personnel had roughed up two teenagers who were arrested following a fight between two schools, says Selangor Criminal Investigation Department (CID) chief deputy commissioner Mohd Adnan Abdullah.

He said the investigation had been classified under Section 323 of the Penal Code for voluntarily causing hurt.

“Hence, we will conduct the investigation fairly and transparently. We urge all parties to give their full cooperation and not to speculate on this case,” Adnan said in a statement posted on Facebook.

He said that on July 27, police received information that a group of students from two schools in Klang were involved in a fight in front of a school.

Subsequently, on July 29 and 30, police from the Klang south district police station arrested 11 boys.

“Nine of them were charged and then let off on police bail. They were released after police classified the case under Section 147 (of the Penal Code) for rioting,” he said.

He added that it was after all of them were released that police received reports from the two families alleging their children were assaulted.

Yesterday, Inspector-General of Police Khalid Abu Bakar assured that the matter was being investigated and that the four police officers allegedly involved in assaulting the two students could be suspended.

Klang MP Charles Santiago alleged that an "unrestrained violence" took place over the weekend, with four cops beating up two 14-year-old students while being interrogated at the Klang south district police headquarters.

"The police personnel, including a woman officer, punched and slapped them on the face, hit them with a rubber hose, stomped on them, pulled their hair and caught them by their necks before slamming them against the wall and sofa.

"The woman officer threw her shoes at one of the boys and slapped him," he said in his Facebook post.

Charles alleged that the incident took place after police failed to get a remand extension for the two students, who were arrested after the gang fight outside their school.