A commando of an elite anti-Naxal force was killed and two policemen were injured while fighting the ultras during an exchange of fire in Maharashtra's Gadchiroli district on Thursday morning, said the police.A commando of the C-60 battalion, Chinna Menta, was killed in the clash when a group of Naxals attacked a police patrol party at Nargond in Bhamragarh taluk in the district. He said the police found bodies of two Naxals from the encounter site.