Bangladesh says it has sent two warships to a disputed stretch of water in the Bay of Bengal, where it is in a standoff with India over energy exploration.
Naval officials say they took action on Friday after India sent its own ships to the region apparently to explore for gas.
Bangladeshi officials say they have protested to India about the incident. India has not yet responded to the accusation.
Last month, Bangladesh faced a similar dispute with its eastern neighbor Burma over another area in the bay.