Sources said the witnesses have been shifted to an unknown location after taking them into custody.
They said LEAs have taken four more people into custody on pointation of the alleged target killer.
“LEAs in the light of evidences are busy day in and day out in finding out accused of Amjad Sabri murder,” said sources.
They also said LEAs have reached close to accused and would soon arrest them.
It is alleged that Sabri was killed after a financial dispute and the failure to pay extortion.
Sabri, the son of another legendary Qawwali singer, Ghulam Farid Sabri who died in 1994, was a fixture on national television and regularly performed on a morning show during the ongoing holy Muslim month of Ramazan. He was killed last month.