<sod >Pakistan has launched a paramilitary operation in an effort toÂ clamp down onÂ Islamist militants after more thanÂ 70 people were killed in a suicide bomb attack.< eod>< sod > More than 5,000 people have been arrested as part ofÂ Pakistan'sÂ paramilitary crackdown onÂ Islamist militants after more thanÂ 70 people were killed in a suicide bomb attack.< eod>