A suspected aide of gangster Chhota Shakeel was arrested from northeast Delhi's Jafrabad, the police said on Wednesday.
The accused was carrying a reward of Rs 50,000 on his head.
During interrogation, it came to light that Naseem alias Rizwan (28), a sharpshooter and close aide of Shakeel, was in touch with the latter, who was giving directions to him to eliminate Pakistan-born Canadian writer Tarek Fatah, the police said.
The police were on the lookout for Naseem, a contract killer wanted in several cases.
On Tuesday, the police received a tip-off that Naseem would come to Jafrabad and a trap was laid accordingly.
When Naseem saw the police personnel, he tried to flee, but was nabbed after a long chase, the police said.
A sophisticated pistol, four live cartridges, and Rs 1.98 lakh in cash were seized from his possession.
The Special Cell had, in June, arrested one Junaid Chaudhary for his alleged involvement in the conspiracy to kill Fatah. Naseem was wanted in that case.
He was also involved in robbing a collection agent of a businessman of Rs 10.6 lakh last month, the police added.
Naseem told his interrogators that he was in touch with Chhota Shakeel, said Deputy Commissioner of Police (Northeast) AK Singla.
The accused also told the police that Shakeel had asked him to eliminate a person residing at Dwarka.
(With inputs from PTI)
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