Police said the explosion at the La-ong Fong laundry in Pong Tham Niwet on Soi Chaeg Wattana-Pakkred 32 in Tambon Talad in Nonthaburi’s Pakkret district happened at 10.30am.
The explosion badly damaged the front of the shop and officials yesterday were trying to determine the cause of the explosion.
Five people were rushed to the Irrigation Department Hospital and two others to Mongkut Chaeng Wattana Hospital. Police said two of the injured were children.