China detects deadly nerve gas at border with NKorea: report 1 hr 51 mins ago TOKYO (AFP) – China has detected deadly nerve gas at its border with North Korea and suspects an accidental release inside the secretive state, a Japanese news report said Friday. The Chinese military is strengthening its surveillance activities after detecting the highly virulent sarin gas in November last year and in February in Liaoning province, the Asahi Shimbun newspaper reported, citing anonymous sources from the Chinese military.