ISLAMABAD, Dec 8 (Reuters) - The suspected planner of last month's attack by gunmen on Mumbai was arrested by Pakistani security forces in a raid on a militant camp, an official with a charity linked to the militant group said on Monday.

The Jamaat-ud-Dawa (JuD) official, who requested anonymity because of the sensitivity of the subject, said Zaki-ur-Rehman Lakhvi was among four men taken into custody following Sunday's raid on a camp used by Lashkar-e-Taiba fighters outside Muzaffarabad, the capital of Pakistani Kashmir.

Pakistani intelligence officers said six men have been arrested, but gave no names, and there has been no official confirmation of the raid.Lakhvi, one of Lashkar's operations chiefs, was named as a ringleader in the Mumbai plot by the lone surviving gunmen captured in India, according to Indian officials.

(Reporting by Abu Arkam Naqash, writing by Simon Cameron-Moore)

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