A close aide of gangster Chhota Shakeel, who carried out underworld activities in India and abroad, was arrested from the city, police said on Monday.
Acting on a tip off, police apprehended Mirza Arif Baig, who is wanted in connection with several murder, attempt to murder and extortion cases, on Sunday from Ghatkopar area, they said.
Mirza, who was staying in Colombo in Sri Lanka for the last couple of months with a fake name Nasir, had flown back to Mumbai on Saturday, Joint Police Commissioner Rakesh Maria said.
Mirza obtained a fake passport in the name of Nasir from Uttar Pradesh in 2004, Maria said.
"Mirza handled operations of Shakeel abroad including Bangkok, Malasia, Hong Kong, Jakarta, Colombo and China," he said, adding "the gangster was responsible for a spate of murders in Mumbai as well."
"Haji Mastan of Chhota Rajan's gang, Custom's officer Farooq Bagata, Gangster-turned-politician Arun Gawli party's Bharat Mhatre were murdered by him in 1998," he said.
Mirza had played a major role in getting escaped his arrested associate Feroz Konkani when he was admitted to JJ hospital in the city in 1998, Maria said.
The gangster was also part of the group which killed Chhota Rajan's aide Balu Dokre in Malasia in 2006, he said.