Sri Lanka, Aug. 2 -- Four people have been wounded after at least six small bombs went off in Bangkok, rattling the Thai capital as it hosted a regional summit attended by top diplomats.

Friday's first explosions were heard during rush hour, just before 9am at two sites near central Bangkok. A third blast was heard shortly afterwards at a government complex hosting several ministries on the northern side of the city. Police recovered at least six bombs exploded at three locations, with one unexploded device also recovered.

Four people were wounded, the Erawan Medical Center said. It added that "none are serious and all are receiving medical attention at hospitals."

Three of those hurt were women cleaning the street when a bomb went off...