KANDAHAR, Afghanistan: A suicide bomber on a motorbike blew himself up near two police vehicles in a border town in southern Afghanistan Sunday, killing six people and wounding 17, police said. The evening rush hour blast in Spin Boldak, on the border with Pakistan, was the latest in a series of attacks on police there by the extremist Taliban who have been waging an insurgency for nearly seven years. The bomber blew himself up near two police vehicles on patrol, Kandahar province police chief Matiullah Khan Qate said.