KUNDUZ (Reuters) - A bomb in a graveyard in northern Afghanistan killed a parliamentary candidate and a retired policeman and wounded five, including a mayor, on Tuesday, an intelligence official said. The attack happened in the Khan Abad district of northern Kunduz province as the men prayed inside the graveyard to mark the Eidul Azha, provincial intelligence chief Abdul Rahman Aqtash said. Mohammad Islam Mujahid, a candidate from Kunduz in Afghanistans September par-liamentary election, and Haji Bismillah, a retired police offi-cial, were killed in the attack, Aqtash said. Bismillah was the brother of the mayor of Kunduz city. The mayor, who had been praying with the other men, was wounded along with four civilians, Aqtash said, adding the bomb had been placed near the grave before the men had arrived. Tuesday marks the first day of Eidul Azha. Afghans traditionally visit the graves of loved ones to offer prayers. It was not immediately clear whether the attack was carried out by Taliban insurgents or by election rivals.