NEW : MQM and the office of Pakistan 's Prime Minister condemn violence in Karachi . Altaf Hussain , 60 , leads Pakistan 's Mutahida Qaumi Movement from the UK . After news of the arrest , MQM called for protests in Karachi , which turned violent . Score: 6 MQM , a force in Sindh province , has second-largest contingent in the provincial assembly .
NEW : MQM and the office of Pakistan 's Prime Minister condemn violence in Karachi . Altaf Hussain , 60 , leads Pakistan 's Mutahida Qaumi Movement from the UK . Score: 6 MQM , a force in Sindh province , has second-largest contingent in the provincial assembly .