The suspended personnel have been identified as three assistant superintendents -- Deepak Sharma, Manmohan, Rohit Mann -- head warder Virender and warders Devender, Anil, Uttam and Rajesh.
Officials said that there have been reports in the recent past of inmates using mobile phones inside the prison premises following which DG (Prisons) Alok Kumar had around a month back formed some special teams to carry out surprise checks.
"During one such surprise check yesterday in jail numbers 8 and 9, three mobile phones along with some other objectionable material were recovered. Following that, eight personnel who were responsible for checking such things have been suspended," said Tihar spokesperson, DIG Mukesh Prasad.
There have been recent instances Delhi Police busting extortion rackets which were being run from Tihar.
On Thursday, Shaukat Pasha, who is serving a life sentence in a murder case and lodged in Tihar was arrested by the Crime Branch for allegedly giving instructions to his henchmen to eliminate a Delhi-based businessman at the behest of suspended IAS officer Sanjeev Kumar who, too, was arrested.