The Assam police has unearthed a Hizbul Mujahideen network, operating in the western part of the state, which had been planning to launch a major attack on the country's commercial capital, Mumbai.

The police said in Guwahati on Tuesday that it had already tipped off the Anti-Terrorist Force and the Maharashtra police, and a team of ATF personnel had arrived in the Assam capital.

The police stumbled upon the whole operation when they arrested a HuJI associate, allegedly involved in fake currency and arms racket, on May 21 from Dhubri area of the state.

Acting on a tip-off, a joint team of the police and Central Reserve Police Force personnel launched an operation in Pratapkhata village under the Fakiragram police station and nabbed one Gulzar [Images] Hussaian.

He was allegedly involved in the fake currency and arms racket and had sustained bullet injuries in his leg during an earlier gunfight with security forces, the police said.

During the search operation, security personnel recovered a five-kg bomb from a tiffin box kept in Hussain's house.

However, the police remained tight-lipped about the whole investigation process.