According to The Express Tribune, a three-man inquiry committee was formed to probe the killing of 27-year-old, Naqeebullah Mehsud.
The team, in its report, cited eyewitness' accounts and said Naqeebullah was 'picked up', along with two others on the suspicion of their linkage with terrorist groups on January 3 by security personnel and taken to the Sachal Police Post before being moved to another location.
On Thursday, Karachi police launched a manhunt to nab Anwar as he was reportedly gone into hiding after he was stopped from travelling abroad on Tuesday.
He was offloaded at Benazir International Airport, Rawalpindi, from a Dubai bound international flight.
"It is confirmed that they are not in their homes and have been gone into hiding. It seems that they are all together but they are trying to dodge investigators by showing their mobile phone locations in various parts of the country," The Express Tribune quoted a senior official privy to the investigations as saying.
"But we are continuously trying to trace their locations. Besides taking technical assistance, we are also using our human intelligence network to trace and arrest them", the official added.
Relatives of Naqeebullah from South Waziristan tribal district rejected claims of him having militant links and maintained that he was an aspiring model who had been a resident of Karachi since 2008.
They added that Naqeebullah was looking for a job and had been running a shop in the city.
His killing evoked a national outcry and triggered protest rallies in several cities. (ANI)