KARACHI, 28 August — At least 60 MQM Haqiqi activists were arrested in night-long raids in different parts of the city following the murder of a political activist on Sunday. Police said Iqrar Hussain, whose body was found in the Lines Area, a locality in the heart of the city, had been a member of the mainstream MQM led by Altaf Hussain. He later defected to the breakaway faction known as Haqiqi group and finally joined the like-minded group of the Pakistan Muslim League. Iqrar Husain alias Jin Baba was kidnapped Sunday and later his body was dumped in a Parsi Colony house. The activists were rounded up by the police here early yesterday. Militants belonging to two rival political groups traded fierce gunfire Sunday in the Lines Area. Several people were wounded in the shootout. Police and paramilitary Rangers had combed the densely populated poor neighborhood before the arrests.