A man captured in security footage taking a photo at the Erawan Shrine on August 17 is requested to urgently contact police, as his image may include the suspected bomber.
National Council for Peace and Order's spokesman Col Winthai Suvaree said police wanted to see the photos taken by the man in a blue shirt to obtain a clear view of the bomber.
The man was seen in footage captured at the scene of attack taking photos of another man with the suspected bomber wearing a yellow tshirt and carrying a backpack in the background. Police have said that the bomber concealed explosives in his backpack and from the footage, he entered the shrine compound, sat down and left without the backpack.
The video footage shown by Winthai gives the time as 6.52pm, some three minutes before the explosion at around 6.55pm.
Winthai also said anyone who knew the man in blue shirt should also contact police. All information given would be kept confidential.