LAHORE - The Pakistan Hockey Federation (PHF) has imposed two years ban on umpire Waqas Ahmed Butt for his participation in Euro Hockey Nations Championships held in Catania/Italia as a regular member of Azerbaijan hockey team without obtaining NOC from the federation. Waqas, who was elevated to the rank of FIH International umpire last year, was found guilty of violating rules and regulations and constitution of his parent body, said Secretary PHF Asif Bajwa here on Wednesday. He said Waqas would not participate in all domestic and international activities as a player and umpire during the two year ban.