their negotiation headquarters, and killed Chinese diplomat Cai Gongshi, eight members of his staff, seven NRA soldiers, and one cook. The exact nature of the killing is contested between the Japanese and Chinese sides, with the Japanese claiming they were attacked from the upper floors, and did not know that the building was a government office or that Cai held the position of negotiator. The Chinese, on the other hand, said that the building was clearly marked, and that Cai's nose, ears, and tongue were cut off, and his eyes gouged out, before he was executed. The other members of his staff were reported by the Chinese to have been stripped naked, whipped, dragged out to the back lawn and killed with machine guns. In response to these reports, Major General Ryū Saitō wrote that the Chinese account was "propaganda", that Cai was simply shot dead during ongoing fighting between the Japanese and Chinese, and that one cannot cut off ears or noses with a bayonet. Negotiations to halt the escalating violence quickly began, with Chiang and Fukuda agreeing to a truce. Chiang, who was not interested in conflict with the Japanese, and wanted to continue the Northern Expedition, agreed to withdraw his troops from the city, leaving only a small number to keep order. On 4 May, however, the Japanese reported that their chief negotiator, Colonel Sasaki Tōichi, was robbed and nearly beaten to death, and only saved by intervention of one of Chiang's officers. In addition, they claimed that Chiang's promise to remove all Chinese soldiers from the Japanese-inhabited commercial area of the city had not been implemented. Speaking after the Sasaki incident, Major General Tatekawa Yoshitsugu said that it was "necessary for Japan to chastise the lawless Chinese soldiers in order to maintain Japan's national and military prestige". Responding to a request from General Fukuda, Prime Minister Tanaka ordered the despatch of reinforcements from Korea and Manchuria in the , which began arriving in Jinan on 7 May. Japanese reprisal on Jinan With his forces bolstered, General Fukuda issued a set of demands to the Chinese, to be met within twelve hours. These were: punishment of responsible Chinese officers, the disarming of responsible Chinese troops before the Japanese army, evacuation of two military barracks near Jinan, prohibition of all anti-Japanese propaganda, and withdrawal of all Chinese troops beyond 20 li on both sides of the Qingdao–Jinan railway.