Staff members clean the explosion site at the Erawan Shrine in Bangkok, Thailand, Aug.18, 2015. [Photo: Xinhua]

Winthai Suvaree, spokesman for the Thai junta, or the National Council for Peace and Order, gave an update on Friday regarding the investigation into Monday's blast in Bangkok, but said he couldn't go into specifics.

'Regarding the investigation, the Royal Thai Police has reported that much progress has been made. However, the details cannot be disclosed at this time because they may affect the investigation."

A Chinese tourist and his Thai guide who were earlier identified as possible accomplices in the Bangkok bombing have been cleared by Thai Police after questioning.

Thai government officials and police chiefs, along with hundreds of people, attended a religious ceremony on Friday commemorating the victims of the blast.