The combined Opposition in the Pakistan Parliament has demanded that the Government should declare the Ahmadiyya sect, a non-Muslim minority, remove all its members from influential and sensitive offices, and arrest Mirza Nasir Ahmad, who describes himself as third Caliph of the sect. The demand, which came yesterday, even from parties professing to be secular, followed a week of anti-Ahmadiyya agitation in Punjab. Today Opposition members walked out of the National Assembly after tear gas was used to disperse 2,000 …