<br/>In Orissa, at least three security personnel were killed and six others injured four of them critically, in a fierce encounter with Maoists in Gajapati district early today. According to police, acting on a tip-off, a team of security personnel including the elite anti-naxal Special Operation Group (SOG) and state police had launched a combing operation in Ambajari forest near Paralakhemundi. A group of Maoists suddenly opened fire at the security personnel who retaliated.<br/><br/> In the exchange of fire, three SOG jawans were killed and six others injured, police said, adding four jawans were shifted to Vishakhapatnam as their condition was stated to be critical.<br/><br/> In another incident in nearby Malkangiri district Maoists blew up a pump house and control room near the pipeline of a private industrial house meant for movement of minerals in Chitrakonda area. About 50 armed ultras raided the area early today and triggered explosion after overpowering and assaulting the guards present at the site.