Two more policemen were killed in clashes with militants on the Chechnya-Dagestan border in North Caucasus on Friday morning. The latest deaths bring the total number to 13 in past three days, Interfax reports. Another police officer was reported injured on Friday. The special operation against militants has been continuing for five days. Artillery and helicopters are being used in attacks on the presumed location of militants in a wooded area in Dagestan’s Khasavyurt district. There is no data yet on fatalities among the militants.