The Tripura government has sounded an alert for heightened surveillance along the 860-kms porous border with Bangladesh in view of the political turmoil in the neighbouring country.
Chief Minister Manik Sarkar said the Central government had alerted the state and "we have alerted our sub-divisional administrations, security forces and Border Security Force to keep a close vigil on the border".
"In fact, we alerted our administration about three months ago because (after) monitoring the newspapers of Bangladesh, we could sense that the situation might turn worse," he told reporters on Monday night.
The Dhaka-Agartala bus service has been stopped since Sunday due to the tense situation in Bangladesh, officials said.
They said Shyamali, the Bangladeshi bus did not come to Agartala from Dhaka on Sunday and the Indian bus Moitree was not sent on Monday.
Custom officials said export and import from Tripura had been stopped for the past three days.
Many Indians who had gone to Bangladesh to visit relatives or for business purposes returned following the turmoil there, state immigration officials said.