islamabad gunmen motorcycle open fire worshippers entrance shi ite muslim mosque pakistan capital islamabad wednesday kill intelligence officer scene police say three four attackers two bike shoot members minority shi ite community leave even prayers residential neighborhood police official ghulam qasim say member pakistan domestic intelligence bureau among worshippers get hit several time die late hospital qasim say sure yet whether sectarian incident qasim add man die get five six bullets seem make target group immediately claim responsibility attack rare capital al-qaeda islamic state-affiliated sunni muslim sectarian group active country four people treat bullet wound police say gunmen kill intelligence officer islamabad shi'ite mosque