KABUL (AFP) - The mayor of an Afghan city was killed in a bomb attack and 30 Taliban-linked militants died in a police operation, among separate incidents of violence reported in Afghanistan Tuesday. The new bloodshed came as world leaders gathered in The Hague to focus on ways to help Afghanistan tackle a growing extremist insurgency and build stability. Sakhi Amirullah Amiri, the mayor of Afghanistans eastern city of Khost , was killed as he was travelling home from work, police said. The mayor has been killed. Two of his nephews and two civilians were wounded in the blast, said Khost province police chief Abdul Qayom Baqizoi. The officials body was badly damaged and one of his nephews was in critical condition, provincial public health director Amir Badshah said. There was no immediate claim of responsibility. The Afghan interior ministry said police had killed 30 rebels in an operation Monday in Uruzgan province that continued Tuesday in neighbouring Helmand province, another hotbed of Taliban activity. During this operation 30 enemies of peace and stability were killed and 17 were injured, it said, adding that Mullah Mohammad Yaqoub, a famous Taliban commander, was among the dead. Several rifles, machine guns and some ammunition were also seized during the fighting, one of the biggest raids against the militants in recent weeks, the ministry said. Uruzgan deputy police chief Mohammand Gulab said that 150 Afghan police took part in the operation and were assisted by international troops. Four policemen were wounded, he said. Elsewhere, in Khost , three militants were killed and two wounded Monday when a bomb exploded while they were training to use explosives, the Afghan defence ministry said. A group of terrorists were training on roadside and remote-control bombs. A bomb exploded during the training session conducted by foreign instructors and killed three of the terrorists, it said. In Helmand, meanwhile, officials said Taliban had been able to capture five policemen. The insurgents confirmed they were holding the men. Last year was the deadliest of the insurgency and 2009 is expected to be just as intense, with presidential elections due in August providing a likely target for anti-government elements.