Thai police on Wednesday offered a reward of 1 million baht (28,100 US dollars) for any information leading to the capture of a suspect of the Bangkok explosion on Monday, which has killed at least 20 people and wounded more than 100 others.

The police released a sketch of the suspected perpetrator who was seen on a surveillance camera at the scene.

Camera footage showed that a foreign-looking, young man, who was wearing a yellow T-shirt and glasses, left a backpack purportedly with some dynamite inside at Erawan Shrine, a popular tourist destination in downtown Bangkok, shortly before the explosion.

The shrine reopened Wednesday morning amid heightened security, but far fewer tourists visited it than before.

Thai Prime Minister Prayut Chan-o-cha urged the "amateur" culprit to surrender himself to the police, warning he could otherwise be killed.

"The bombing suspect could probably be killed if he did not surrender for his own safety. His life is being fatally jeopardized by those who had hired him and might be looking to silence him," Prayut said.

Meanwhile, police chief Somyot Poompanmoung believed that the bombing was carried out by "a network."

According to the latest update from the Chinese Embassy in Thailand on Wednesday, six Chinese nationals, including four from the mainland and two from the Hong Kong Special Administrative Region, have been confirmed dead in the blast.


Read more in Special Coverage: