(KUNA) -- Police Friday killed 11 Maoist guerillas including top leaders in the Southern Indian state of Andhra Pradesh. As many as nine Maoists, including three top leaders of the Communist Party of India-Maoist (CPI-Maoist), were killed in an encounter in the Badvel forests of Andhra Pradesh Friday, news agencies reported. Police seized 12 weapons including one AK-47 rifle, three self-loading rifles and four .303 rifles from the encounter spot. In a separate encounter in Warangal district of Andhra Pradesh on Friday, the police killed two Maoist guerillas, the agencies said. The CPI-Maoist is the most powerful and biggest Maoist group in India and Andhra Pradesh is its stronghold. The police in Andhra Pradesh have killed about 150 Maoists including more than a dozen top leaders of the outfit this year. Maoist violence in Andhra Pradesh has claimed more than 6,000 lives since 1967, when the Maoist movement began in India.