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Police quoted witness as saying a bag was dropped from the flyover over the Ratchada-Rama IV Intersection, causing the explosion at 1 am Friday.

Bomb disposal officers have yet to determine the type of the bomb.

Some 1,000 vendors have been staging a protest at the intersection since Tuesday afternoon against the Port Authority of Thailand and Legal Professional Co. The Legal Professional has won the concession from the PAT to manage the market and ordered existing vendors to leave so that it could redevelop the Klong Toey market complex.

The injured protesters were rushed to the Kluay Nam Thai and Chulalongkorn hospitals.

Two of them were severely injured. They are Yakob Lohmoh, 51, and Penthiwawan Kaewsuk, 37.

Sujittra Damrongsiri, 52, a protester, said she saw a man on a motorcycle dropped a plastic bag onto the tent where the protesters were resting and an explosion occurred shortly.

Pol Lt Col Prapassorn Chartprom, deputy commander of the Tha Rua police station, quoted witnesses as saying that the bag did not explode immediately but it exploded about five seconds after it landed on the tent's roof.