Eventually the doors to Parliament could be opened for the attending legislators. PAD forces later regrouped around Parliament and again blocked the gates. After the government had made its policy statement to the legislature, police again clashed with PAD forces so that the legislators could leave the building. Clashes continued into the night. Several protesters lost hands and legs, although at first it was not clear if these injuries were caused by tear gas canisters or the 'ping-pong' bombs which are explosives housed in ping-pong sized plastic balls. Director of the Central Institute of Forensic Science Pornthip Rojanasunand used the GT200 explosive detection device to try to identify explosive residue on the protesters; not finding any, she concluded that faulty Chinese-made tear gas grenades had caused the injuries. A PAD protester, Miss Angkhana Radappanyawut, was killed. Dr.Pornthip stated unequivocally that her death was caused by the explosion of a tear gas canister directly striking the victim's body. She also stated that there was no need to conduct further investigations into the death and injuries of protesters because it was clear they were caused by police weapons. Afterwards, doctors from many major hospitals issued a statement, calling the counterattack by the Prime Minister and police unnecessary "brutality", and refusing to provide medical care to the police. The doctors claimed that many field rescue workers, including doctors and nurses, had also been attacked, and some were wounded. Doctor Suthep Kolcharnwit of the Chulalongkorn University Faculty of Medicine, with several doctors from Chulalongkorn Hospital, also refused to provide medical care to policemen injured in the clash, and urged doctors of other hospitals to boycott the police as well, though his actions were later disowned by the hospital and a case against him was filed with the Medical Council's ethics committee. PAD vowed to file charges against the government and police. On 8 October, Queen Sirikit attended the cremation of one of the young PAD woman who had been killed. Seizure of Suvarnabhumi International Airport Seizing the airport On the evening of Tuesday 25 November 2008, the PAD executed what they called "Operation Hiroshima." A convoy of hundreds of PAD members dressed in yellow blocked the two ends of the road in front of the terminal building of Suvarnabhumi International Airport and blockaded the main road to the airport. The airport is Bangkok's main airport and an important regional hub. PAD forces quickly overpowered