Gangster Abu Salem, an accused in the 1993 Mumbai blasts case, was on Thursday attacked inside Taloja Central Jail in neighbouring Navi Mumbai, police said.
According to police, Salem was shot by Devendra Jagtap, an accused in the advocate Shahid Azmi murder case.
Salem sustained injury to his hand as Jagtap fired one round.
This is the second attack on Salem inside a jail after he was deported from Portugal in 2005. He had faced attack at the Arthur Road jail here in 2010.
The incident took place at about 8.30 pm, police said, adding that they were also probing how a firearm reached Jagtap inside the prison.