LAHORE: Police have received a tip about the killers of Ghulam Hussain Najafi, vice-principal of the Jamia al-Muntazir, and they will be arrested soon, Model Town SP Investigation Rana Munawar said on Saturday. The SP told Daily Times that raids were being conducted to arrest the assassins. He said six suspects had been arrested so far. The police have information about the whereabouts of the street vendor who blocked the Shia cleric's vehicle in Q-Block Model Town by placing his cart in front of the car, he said. Three unidentified men gunned down Najafi when he was on his way to Friday prayers at the Jamia Muntazir. Minutes before the attack, he had delivered a lecture on "Sakina Bint-e-Hussain". His daughter Mariam and another female student were also wounded in the attack. Two motorcyclists fired more than a dozen bullets at his car. Najafi had been attacked twice, in Nawab Shah, Sindh, and in R-Block Model Town, Lahore. He had written over a dozen books and had been receiving death threats for a long-time. He did not have any bodyguards.