Maoist rebels killed 75 policemen in a jungle ambush in central India on Tuesday in the worst-ever massacre of security forces by the left-wing extremists, officials said.
Here is a chronology of major attacks against Indian security personnel since 2005 by the rebels who launched their armed campaign in 1967.
Sept 4: Twenty-four paramilitary soldiers die in a blast triggered by suspected Maoists in Chhattisgarh.
Sept 12: At least 15 people die when suspected Maoists raid a village in eastern Jharkhand state.
Oct 8: Twelve policemen are killed in a suspected Maoist explosion in Jharkand.
Feb 6: At least 11 security personnel are killed in attacks by suspected Maoists in Chhattisgarh.
Feb 28: Maoists kill at least 25 anti-Maoist campaigners after ambushing a convoy of trucks ferrying the activists in central Madhya Pradesh state.
March 25: Thirteen civilians die in Chhattisgarh after their vehicle hits a landmine believed planted by Maoist rebels and intended for security forces.
April 29: Fifteen people kidnapped by Maoist rebels are found dead in a Chhattisgarh forest.
June 1: Twelve paramilitary troops are killed in a land mine attack as they return from a bomb defusing mission in West Bengal.
July 18: At least 30 people die after suspected Maoists attack a relief camp in Chhattisgarh.
Dec 2: At least 14 Indian paramilitary soldiers die in landmine blast triggered by suspected Maoist rebels in Jharkhand
March 4: Maoist rebels assassinate a federal MP and five other people as they attended celebrations of the Hindu festival of Holi in Jharkhand.
March 15: Maoist rebels kill 55 policemen in Chhattisgarh.
July 10: At least 24 Indian troopers and 20 Maoist insurgents are killed in a gunbattle in Chhattisgarh.
Oct 27: At least 18 people, including a former minister's son, die in a Maoist attack at a football match in Jharkhand.
June 29: At least 38 members of an anti-Maoist force killed in a Maoist attack in Orissa.
July 16: At least 21 police commandos are killed in Orissa when their vehicle runs over a suspected Maoist landmine.
Aug 30: Twelve policemen killed in a Maoist landmine blast in Jharkhand.
Oct 20: Twelve paramilitary policemen die in a suspected Maoist ambush by suspected Maoists in Chhattisgarh.
Feb 1 : Fifteen police officers are killed in western Maharashtra state in a shootout with Maoists.
April 11: Indian Maoists ambush and kill 10 policemen in Chhattisgarh.
June 20: At least 11 special police personnel die in a suspected Maoist landmine blast in Chhattisgarh.
July 12: Indian Maoists kill 30 policemen in two ambushes in Chhattisgarh.
Oct 8: Maoist rebels gun down 17 policemen in Maharashtra.
Oct 2: Suspected Maoist rebels kill 16 villagers in eastern Bihar state over an apparent land dispute.
Feb 15: At least 25 policemen die after Maoists overrun a security camp in West Bengal state.
April 4: At least 10 Indian policemen die when their vehicle runs over a landmine planted by suspected Maoists in Orissa.
April 6: Maoist rebels kill 75 policemen in a jungle ambush in central India in the worst-ever massacre of security forces by the left-wing extremists.