NEW : Intelligence warned of possible Lahore attack . Militants said to be from Waziristan tribal region . While the greatest number of its followers are in Pakistan and India , Ahmadis have a presence in many European countries , such as Britain , where the religion 's fifth and current spiritual head , Mirza Masroor Ahmad , resides . 98 killed in Pakistan's worst terror strike since 2008. Attackers targeted houses of worship for persecuted sect .
NEW : Intelligence warned of possible Lahore attack . Militants said to be from Waziristan tribal region . 98 killed in Pakistan's worst terror strike since 2008. Attackers targeted houses of worship for persecuted sect .