Federal Minister for Interior Rehman Malik has said that the investigation of the murder of Qari Zainuddin has been underway. Qari Zainuddin, a rival commander of Baitullah Mehsood, was killed by a gunman this morning in Dera Ismail Khan. Talking to media outside the Parliament House here, Interior Minister said the terrorists were killing their opponents and cited the assassination of Dr Sarfaraz Naeemi who was killed in a bomb attack in Lahore. Rehman Malik said the government was very serious about the probe of the terror strikes in Mumbai. He vowed that the country will get rid of the terrorists soon.