The report quotes sources as saying that Ehsanullah Ehsan, the former spokesman for Tehreek-e-Taliban Pakistan (TTP), made his escape while an operation against terrorists was being conducted on the basis of a tip-off given by Ehsan.
Ehsanullah Ehsan had surrendered before the Pakistani authorities in February 2017 and remained in their custody ever since.
The sources also claimed that he had started sharing sensitive information with the authorities way before his surrender.
On Thursday, an audio clip of a man claiming to be Ehsanullah Ehsan started doing the rounds on social media after it was shared by a New York Times journalist Tipu Mehsud. In the audio, the man claiming to be the former TTP chief said he had escaped from the custody of Pakistani institutions 'with Allah's help'.