Tourists and foreign workers in Bangladesh have been urged to take extra precautions after the death of an Italian reportedly by Islamic State gunmen in the capital Dhaka.
The extremist group has claimed responsibility for the killing of Italian citizen Cesare Tavella.
The US and UK governments have issued advisories for their citizens in the country.
"As of late September 2015 there is reliable information that militants may be planning to target western interests in Bangladesh," the British embassy said in a statement.
A US embassy statement said: "In light of the increased threat, US citizens should consider limiting their attendance at events where foreigners may gather."
Both countries have limited the movements of embassy staff as the shooting took place close to Dhaka’s diplomatic quarter.
The claim that Islamic State was responsible has not been independently verified but if proven would be the first time it has been active in Bangladesh.
"We have seen news about this claim, but we will have to examine how authentic this claim is," said Muntashirul Islam, deputy commissioner of the Dhaka Metropolitan Police.
At the weekend Australia’s foreign ministry said it had ‘reliable information to suggest that militants may be planning to target Australian interests in Bangladesh,’ which prompted a planned tour of Bangladesh by the Australian cricket team to be postponed.
