Bangladesh has stepped up the security of Indian High Commissioner Pinak Ranjan Chakravarty and at the Mission in Dhaka after the envoy received a threat through e-mail, a report said on Monday.

'Amaeder Samoy', a tabloid, said Chakravarty received an e-mail threat in August 28 prompting authorities to increase security for the envoy and other Indian diplomats in Bangladesh.

However, the Indian envoy declined to comment on the issue.

"It is our policy not to comment on our security issues," Chakravarty said.

However, police said they have intensified the security of the Indian envoy and other diplomats as part of a nationwide security alert issued recently.

The home ministry officials were not available immediately for comments but a senior police official preferring anonymity said "we routinely keep an extra security vigil on foreign embassies which are deemed to be exposed to security threats".

The media report also said Al-Qaeda or Harkatul Jihad Bangladesh (HuJI) may be behind the email threat.

Activists of the liitle-known Lamp Post tried to gate crash the Indian High Commission in Gulshan area recently in protest against New Delhi's stance on maritime boundary disputes.

Inspector General of Police Noor Mohammad said they knew about the "threats" and took necessary measures to intensify the security of the envoy and other diplomats of the high commission.

"We have been receiving reports of threats to the Indian high commission for the past several days and took steps to maximise the security of the diplomats at their office, home and during their movements," Mohammad said.