Twelve Maoists were killed in a gunbattle with security personnel in Jharkhand's Palamau district, police said on Tuesday."Twelve Maoist guerrillas were killed in a gunbattle with the policemen on Monday night in a jungle in Palamau district," a police officer told IANS.Police raided a Maoist hideout on a tip-off.Anurag alias 'doctorji', a sub-zonal commander of the Maoists who carried a reward of Rs.10 lakh on his head, was among those killed.Police have seized eight rifles from the spot.