ISLAMABAD, Nov 21 (Reuters) - A blast targeted the funeral of a Shia Muslim man gunned down earlier on Friday in the northwest Pakistani town of Dera Ismail Khan, and casualties were feared among the mourners, police said.

Sectarian violence between militant Sunni Muslim and Shi'ite groups has plagued Dera Ismail Khan, a district bordering the South Waziristan tribal region, where support for the Taliban and al Qaeda runs deep. (Reporting by Zeeshan Haider, writing by Simon Cameron-Moore)

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