Bangkok bombings: Sketch of suspect wanted after deadly blast released by Thai police

Thai police have released a sketch of the suspect wanted after Monday's deadly bomb blast in Bangkok.

The image shows a young man with glasses and shaggy hair, and was created using facial recognition technology.

But authorities have still not established the nationality or whereabouts of the man they suspect bombed the Erawan shrine, killing at least 20 people.

Police chief Somyot Pumpanmuang told a news conference that it was not clear how many people were involved in the attack or if they were still in the country.

"I don't suspect one person, I suspect many people," he said. "I am confident that there are Thais involved but I am not saying it is just Thais or that there are foreigners."

Grainy CCTV footage was released yesterday, showing a young man dumping a backpack at the scene and walking away.

The government says the attack was aimed at wrecking the economy, which depends heavily on tourism.

No one has claimed responsibility for the blast, which wounded more than 120.

Deputy police chief Jaktip Chaijinda said investigators believed the man on the video resembled a foreigner more than a Thai.