Six bomb blasts wounded at least four people at three sites in Bangkok on Friday, as the Thai capital hosted a regional security meeting of foreign ministers from the Association of Southeast Asian Nations (ASEAN) and their counterparts from world powers including the United States, China and Russia. The first small explosions were heard during rush hour, just before 9 a.m. (0200 GMT) at two sites near central Bangkok. A third blast was heard shortly afterward at a government complex hosting several ministries on the northern side of the city. 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. Pictures on local websites showed them looking dazed and getting treatment from medics. One was seen being loaded into an ambulance. The other casualty was from a device that exploded near the 77-storey King Power Mahanakhon building, one of the tallest in the city. Police Colonel Kamtorn Uicharoen told Reuters a total of six bombs exploded. One was recovered before it blew up. There was no immediate claim of responsibility.