Iskander Ehet , Turgun Tohtunyaz and Hasayn Muhammad were executed . Comes after their role in a knife attack at China railway station last year . The incident saw masked men kill 31 people with knives and machetes . The attack which injured 141 people was dubbed as 'Kunming 's 9/11 ' Men were convicted of intentional homicide and being in a terrorist group . But campaigners have said they may not have been granted a fair trial .
Iskander Ehet , Turgun Tohtunyaz and Hasayn Muhammad were executed . Comes after their role in a knife attack at Kunming railway station last year . The incident saw masked men kill 31 people with knives and machetes . The attack which injured 141 people was dubbed as 'China 's 9/11 ' Men were convicted of intentional homicide and being in a terrorist group . But campaigners have said they may not have been granted a fair trial .