Kothagudem: In a major offensive against naxals, six cadres, including the CPI (Maoist) Party Manugur area committee secretary Lachhanna, were killed in the district on Thursday. According to police, an exchange of fire took place between Telangana Greyhounds and Maoist Lachanna dalam at Damaratogu area of Gundala mandal and Niladripet forest area of Karakagudem mandal.