Hundreds of ethnic Serbs erected barricades on a road in northern Kosovo on Saturday, blocking the traffic over the two major border crossings towards Serbia, police said. Trucks, ambulance cars and agricultural machines were used as roadblocks, fuelling recent tensions which included explosions, shootings and an armed attack on a police patrol which saw one ethnic Albanian police officer wounded. Demonstrators told AFP they were outraged over the arrest of a former ethnic Serb policeman, who is suspected of being involved in recent attacks on Kosovo police officers. The protest was announced …