Four civilians were killed and 10 injured on Wednesday when a remotely controlled motorbike bomb exploded in an Afghan town on the border with Pakistan, police said. Officials blamed the attack in the town of Spin Boldak in Kandahar province on the Taliban. “There was a motorbike bomb blast against border police in Spin Boldak. Four civilians, one of them a woman, were killed and 10 others were injured,” said Janan, a police unit commander.