KARBALA, Iraq (AFP) - Gunmen killed 22 Shiite Muslim pilgrims on their way to Syria as they were passing through a predominantly Sunni Iraqi province from the shrine city of Karbala, officials said on Tuesday. The group had all been passengers on a bus passing through Anbar province, long a stronghold of Sunni insurgents and Al-Qaedas front group in Iraq, when their vehicle was stopped by gunmen at 9:30 pm (1830 GMT) on Monday. Separate violence in and around Baghdad, meanwhile, killed four people on Tuesday and wounded eight, an interior ministry official said.