Maoist rebels have blown up a bus in a southern Indian state, killing 14 people and wounding 16, the state government reported.
Police said guerrillas of the outlawed Peoples War Group, who are fighting to provide land for peasants, thought the bus in Andhra Pradesh state was carrying policemen when they detonated a landmine on Monday night.
The passengers were returning from a weekly village market when the blast occurred, killing 13 people instantly.
The attack, which comes after police began drive against the militants, is the deadliest since a train coach was set on fire by the group in 1990, killing at least 46 passengers died.
More than 6,000 people have been killed since the group began fighting in 1981 to end what it called government repression. It is active in five states in India, with Andhra Pradesh being its stronghold.
The group has in the past targeted rich landowners and government offices.