India has deployed additional troops along its border with Bangladesh after a political crisis in the neighbouring country toppled the government of Prime Minister Sheikh Hasina.
Ms Hasina fled Bangladesh to India on Monday, where she spent the night. Her current whereabouts have not been disclosed.
India has not yet officially discussed the developments, but the federal government has summoned opposition parties for a meeting.
India shares a 4,096-kilometre (2,545-mile) border with Bangladesh and has close economic and cultural ties with the country.
Prime Minister Narendra Modi held a meeting on Monday to discuss the situation. External Affairs Minister S Jaishankar may make a statement in Parliament on Tuesday, according to reports.
There are concerns that the ongoing tensions in Bangladesh could spill over into India, which has supported Ms Hasina throughout her 15-year tenure despite a crackdown on dissent and jailing of opposition leaders.
Five Indian states share a border with Bangladesh, which was formed in 1971 after a war with Pakistan. About 915.35 km of the border remains unfenced, according to government data from November last year.
From a security perspective, Ms Hasina’s tenure has been relatively peaceful for India as she cracked down on anti-India militants in her country. She had also granted transit rights to secure trade routes for states bordering Bangladesh.
On Monday, senior officials of India’s Border Security Force (BSF) visited the Bangladesh border in the eastern state of West Bengal to assess “the operational readiness and strategic deployment of the BSF in these key border areas”, a spokesperson said.
The BSF said “it has received strict instructions from the government not to allow anyone into the country without valid documents”.
Train services between India and Bangladesh have been suspended indefinitely. Trains have been halted since mid-July after violent protests broke out in Bangladesh.
India has also asked its citizens in Bangladesh to exercise “extreme caution”.
More than 4,500 Indians returned to the country in July with the help of diplomatic missions in Bangladesh.
On Monday, the northeastern state of Meghalaya imposed a curfew along its border with Bangladesh following the resignation of Ms Hasina.
In West Bengal, the state with the longest border with Bangladesh and close linguistic and cultural ties, Chief Minister Mamata Banerjee has called for peace.
Goods movement through the Petrapole land port on the border has also been halted. Reports say hundreds of Indian trucks are stuck on the Bangladeshi side.
A senior diplomat told the BBC on Monday that India “doesn’t have many options at the moment”.
“We need to tighten controls on our borders. Anything else would be seen as interference.”
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