LAHORE –The provincial government has constituted a joint investigation team, comprising policemen and intelligence officials, to nab the criminals involved in the murders of leading eye-surgeon and his 12-year-old son. “We are clueless so far and investigation is underway to unearth the killers behind the assault,” a police officer said. To a question about the possible motives behind the gun attack, he said that the police were investigating the double-murder case keeping in view all aspects of the happening. “At this stage, we cannot say anything. The possibility of sectarian motives behind the onslaught could not be ruled out,” he added. According to a police investigator close to the team investigating the killings, one thing has been established that the killings were planned and the surgeon and his son were targeted by unidentified motorcyclists. Intelligence sources revealed the involvement of militants linked to banned outfits particularly Lashkar-e-Jhangvi could not be ruled out.