Kou Voravong
The attack occurred at approximately 22:15, at Phoui Sananikone's, an official residence nearby the Voravong family's. The attackers launched three grenades by one of the windows on the ground floor, in the dining room. They fired three or four pistol shots and then run away. Kou voravong, sitting with his back to the window, was directly hit by a bullet which came in by the kidney and out through the navel, after cutting the vena cava and crossed the liver and intestines. His dead is declared shortly after admission to hospital. A dozen people were injured by the explosion of the grenades, slightly for most of them.
Kou Voravong
This band of gangsters was hostile to France and ploted against the Royal Government. It was partly formed by soldiers who have deserted the Chinaimo camp, located near the capital. The conspiracy's members are gathered and hosted by the Thai police under the order of Colonel Praseuth (thai : ประเสริฐ), in Nong Khai, a border city located only 20 km from Vientiane. It appeared clearly that the Thai police, with or without the approval of the Government, supported the plot of Chinaimo which projected to reverse the Souvanna Phouma's government in order to return power to Chao Phetsarath, exiled in Bangkok since 1946. In addition, Thai authority appeared to have an ambiguous policy towards this case: they protected the conspirators of the Bounkong's band at the beginning, before eliminated most of them. They have constantly refused to extradite Oudom Louksourine, who would still sentenced to death in absentia for Kou Voravong's assassination by the Court of Vientiane in July 1959. At that time, he was captain in the Thai police.