• The strongest evidence the police have so far is grainy CCTV footage of a man who left a backpack at the Erawan Shrine shortly before the explosion
• The police issued an arrest warrant for a “foreign” man, apparently basing this only on the fair colour of his skin, but senior officers disagreed over whether or not he was wearing a disguise
• Two other men seen in the CCTV footage are also suspects, the police said, without giving details of their appearance

The Thai police released a sketch of a young bespectacled “foreign man” who carried out the devastating bombing at Lord Brahma temple here and is believed to be part of a network while announcing a reward of 1 million baht ($28,000) for information leading to his arrest.

The police also issued an arrest warrant against the suspected youth who was captured on CCTV wearing a yellow T-shirt and placing a backpack on a bench inside the Erawan Brahma temple’s compound before walking out just before the explosions on Monday that killed at least 20 people.

The sketch shows a young man in black-rimmed eyeglasses with bushy, dark hair and a light complexion. The warrant issued by Bangkok’s Southern Criminal Court describes him as tall, with a pointed nose and thick lips. He faces six charges including conspiring to commit premeditated murder and conspiring to commit a bombing that resulted in death and severe injuries. The sketch of the suspect is based on the CCTV footage and a description provided by a motorcycle taxi driver who is believed to have given him a ride on Monday night.

The detailed sketch is the strongest lead yet in the country’s “worst ever attack” in which nine foreigners and 11 others were killed and over 120 others injured, mostly Chinese.

National police chief General Somyot Poompanmuang told a news conference that the suspect looks like a “foreign man” but was not sure about his origins.

The suspect might have been in a disguise and wearing a fake nose to conceal his identity, Somyot said. Thai PM Prayut Chan-o-cha urged bombers who attacked Bangkok this week to turn themselves in for their own safety, saying, otherwise, they could be killed.