People injured in the melee who later filed complaints with police could not remember the faces of people who hurt them, police said yesterday.

Pathum Wan police chief Colonel Wallop Prathummuang said police had a CD recording of the incident from ASTV. However, they would need more evidence to look into the complaints.

He said police had accepted six cases in relation to the attacks on Monday. Three of these matters were physical assault cases.

Three people who were injured - Itthiphon Sorawitsakul, Vasu-porn Boonmee and Khwanchai Juimanee - were asked to identify the individuals who beat them. But police said they were not confident about the identities of their attackers and wanted to collect evidence from the media.

Police officers arrested three men during the fighting. They were Vichai Uasilaphan, Ritthirong Likhit-prasertkul and Mongkol Boontem.

Vichai and Ritthirong were charged with causing a nuisance to the public, but they neither denied nor accepted the charge before being temporarily released after the police recorded their names.

Mongkol confessed, was fined Bt1,000 and released later, Wallop said.

Wallop said two unidentified men who acted like police officers and forcefully manhandled the protesters were not officers from Pathum Wan police station. His officers were investigating whether they were policemen.

Media recordings of the drama would need to be studied to find out if their conduct was unreasonably violent, he said, saying he wasn't at the scene.

Police would seek to prove that they did nothing wrong in their handling of the incident, he said, adding that both supporters of and protesters against the prime minister went to the venue "for a purpose".

The police had not ignored the clashes, he said, but they were moving from the place when the fighting erupted as the prime minister had departed.