A suicide bomber on a motorcycle attacked a border police patrol on Monday in southern Afghanistan, killing a policeman, as clashes and a roadside bomb elsewhere left nine people dead, officials said. Four other policemen were seriously wounded when the bomber struck the police vehicle in the Spin Boldak district of Kandahar province, said border security police commander Gen. Abdul Raziq. In neighboring Helmand province, police discovered and tried to defuse a remote-controlled roadside bomb Monday in Nad Ali district, but it exploded, killing two policemen and two civilians, said provincial police chief Mohammad Hussain Andiwal. Four other civilians were wounded. In the Zhari district of Kandahar, three Taliban militants were killed in a battle between police and NATO troops on Sunday, the Interior Ministry said in a statement. Another militant was detained during the operation, it said.