Mumbai Police claim to have cracked the murder case of Jyotirmoy Dey, arresting seven men for killing the investigative journalist at the behest of mafia don Chhota Rajan but have yet to ascertain the motive, a top police official said here Monday. The arrested have been sent to police custody.

Addressing media persons, Joint Commissioner (Crime) Himanshu Roy said all seven accused, who did not have any idea of their target's identity, will have the stringent Maharashtra Control of Organised Crime Act (MCOCA) slapped against them once charges are framed.