KABUL (AFP) - A roadside bomb killed four civilians in Afghanistan's southwestern province of Farah Thursday, the provincial police chief said. "A civilian vehicle hit a roadside bomb planted by terrorists in Parchaman district today, resulting in the death of four of our countrymen and injuring eight others," said Sayed Mohammad Roshandel. There was no immediate claim of responsibility for the attack, but roadside bombs are frequently planted by Taliban-led insurgents fighting a decade-long war against NATO-led foreign troops and Afghan government forces.