Authorities in India say an attack by Maoist rebels has left between 50 and 60 policemen dead.
The rebels are reported to have carried out an ambush in the state of Chhattisgarh.
This is one of the worst attacks by the insurgents in recent years.
It follows a bomb blast on Sunday that killed at least 10 policeman.
The rebels have stepped up attacks in response to a police offensive that began late last year.