(KUNA) -- Three workers of Benazir Bhuttos Pakistan Peoples Party (PPP) were shot dead by unknown gunmen in Southwestern Baluchistan province on Saturday, police said. The workers were killed in the party office in Naserabad district, 250 kilometers east of Quetta, the provincial capital, in a pre-dawn attack, a local police officer, Maula Dad, told newsmen. He said armed-men entered into PPP office and sprayed bullets at sleeping men, killing all three of them on the spot.The killing came as Pakistan is heading toward parliamentary elections in January 2008 and all parties are gearing up for election campaign.