In April 2010, The People's Republic of China executed four Japanese citizens who had been convicted of trafficking methamphetamines. They were the first Japanese to be executed in China since the two countries normalized diplomatic relations in 1972. At the time of their demise the condemned men—Akano Mitsunobu, Takeda Teruo, Mori Katsuo, and Ukai Hironori—were ages 65, 67, 67, and 48, respectively. All were killed by lethal injection in a province (Liaoning) that borders North Korea—the nation which may have been the source of the drugs—and all were either members of the yakuza or drug mules for them.