RANCHI: Maoist rebels killed 11 policemen in separate attacks Friday in apparent retaliation for the slaying of a rebel leader in eastern India, officials said. Armed gunmen raided a bank in Jharkhand state's Bokaro city and shot dead two policemen, senior police officer Prashant Kumar said in state capital Ranchi. In a separate attack, nine other policemen died in a landmine blast in a Bokaro suburb, Kumar added. Thirteen others were injured in the two attacks, which came two days after another 11 police were killed in Jharkhand. Kumar said the wave of attacks was in retaliation for the recent killing of a senior guerrilla leader in nearby Andhra Pradesh state.