The two “ping-pong” bombs were found at around 2pm in front of a 7-Eleven shop on Tiwanon Road in Nonthaburi province.

Police said they thought that the homemade bombs were made by vocational students for use against their rivals.

Quoting a food vendor, Pak Kret police said the bombs were possibly brought to the scene and hidden by a group of five teenage men who reportedly went to the convenience store on three motorcycles.

The food vendor said two groups were involved in a chase on motorcycles. A loud bang was heard and a used ping pong bomb was later found in the area.