BANGKOK (AP) - A police manhunt was underway Wednesday for an "unidentified foreign man" shown in a security video leaving a backpack at a popular Bangkok shrine just minutes before a bomb exploded there.
Two other people seen on the video near the man are also considered suspects in Monday's deadly bombing, police said.
Authorities released a sketch of the man who left behind the backpack and offered a $28,000 reward for information leading to his arrest. But apart from the rough portrait, they had few solid leads in Monday's bombing at the Erawan Shrine that killed 20 people and wounded 120 others.
The grainy security video shows the man, wearing a yellow T-shirt and shorts, sitting down on a bench at the shrine, taking off a black backpack and leaving it behind as he stands up and walks away. Time stamps show he left the shrine 15 minutes before the explosion, which struck just before 7 p.m.
The two possible accomplices are seen standing in front of the man, said police spokesman Lt. Gen. Prawut Thavornsiri. One of the men was wearing a red shirt and the other was in white, and they were seen leaving the area shortly before the man in yellow also leaves.
At a news conference, Prawut expressed uncertainty about the man's origin, saying the suspect "looks like a foreigner" but "might have been in a disguise and wearing a fake nose" to conceal his identity.
Prawut told reporters Wednesday night that police would continue to scrutinize closed-circuit TV footage of the area from before the blast for clues about suspects. He said that if the men in red and white shirts were innocent and aware of the suspicions against them, they should report to police.
Two days after the attack, which authorities have called the worst in Thai history, the shrine reopened to the public. No one has claimed responsibility for the blast at one of the capital's busiest intersections during evening rush hour.