A Bt1-million bounty has been offered for anyone able to identify a man in a police video clip released yesterday that shows him planting a bomb near Saphan Khwai intersection in Bangkok on New Year's Eve.

However, the two-minute footage did not reveal the face of the lone suspect, who wore a white baseball cap and looked down to the ground all the time while on his way to plant the bomb at a police box, then walked away.

The man, who appeared to be around 25-30 years old, wore a blue short-sleeved shirt and a pair of paler blue jeans, plus he had a belt pack on his shoulder.

The video recorded the suspect at 4.53pm on December 31 - just over an hour before the 6pm blast that injured a woman walking past the police box.

The bomb was one of about nine that went off at sites throughout central Bangkok that night.

Deputy police chief Phatcharawat Wongsuwan said the man had a characteristic way of walking and people who knew or had seen him should inform

police or call 02-255-9977.

He said investigators were also deciding whether to release video footage from security cameras at Seacon Square and the Major Ratchayothin movie complex. A decision is needed as to whether releasing the footage would be useful to the police.

The police general said arrest warrants would be sought against all suspects linked to the nine bomb attacks after police produce evidence to use against them.

He would not comment when asked if there should be an investigation to find out who leaked a photo of a suspect to media two weeks ago.

The mugshot of Ramkham-haeng University dropout Thawalsak Paenae was leaked to the media one day after the Justice Ministry's Department of Special Investigation began a joint probe into the bomb attacks at the order of Prime Minister Surayud Chulanont.

The DSI later handed the case back to police after Seripisut Temiyavej replaced Kowit Watana as national police chief earlier this month. DSI Sunai said later he was sure the media leak was not from DSI agents.

Thawalsak is wanted by Yala police for alleged links to many bomb attacks at commercial banks in the strife-torn South. He is now on the run.

Watch the video clip of New Year's bombing