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Schools are among the possible targets of an "imminent" threat to Westerners in the Libyan city of Benghazi, according to reports.
All Britons have been urged by the Government to leave the city after it became aware of the "specific and imminent threat."
European officials, who did not want to be named, said that schools, businesses and offices of non-governmental organisations were among the potential targets, according to the Associated Press.
US Secretary of Defence Leon Panetta has said that the danger in Benghazi is "no mystery" as the British, Dutch and German Foreign Offices in advising citizens to leave the Libyan city of Benghazi.
He said, "It's no mystery that it's a dangerous situation there and everybody in that area I think is very concerned that they simply can't provide the security necessary to protect people in those places. I think that's why these countries have made the decision that they've made.
"As far as I know we have not been asked to participate in moving any people out of Benghazi."
The deputy leader of the Libyan congress, Jumma Atigahas, has said he was surprised at hearing of the Foreign Office's warning of an immediate threat to foreigners in Benghazi.
He said: "We were surprised at this announcement, but let me say in principle any country has the right to warn their citizens if they felt there was any danger, however slight that danger is.
"In regards to Benghazi, everyone knows that Benghazi is targeted because of its high symbolic significance in leading the revolution and there have been a number of incidents there.
"But I affirm that Benghazi now has a security plan to protect its citizens and foreigners.
"I want to say that terrorism has no religion or country.
"Terrorism can strike anywhere in the world, even in countries like Britain who aren't immune to terrorism.
"But to have this announcement that hints at something that doesn't really exist on the ground is not justified enough in our opinion."
Germany and the Netherlands have warned their citizens to leave the city of Benghazi due to a specific threat to Westerners.
The Dutch Foreign Ministry warned its citizens to avoid Benghazi and the area to its east, saying the security situation was uncertain and that there was a risk of violence.
"All journeys, including for transit, and stays in certain regions, specifically Benghazi and the region to its east, are advised against," the ministry said on its website.
The German Foreign Ministry declined to give any further details to explain its warning. Berlin had warned Germans since last week's deadly attack by Islamist militants in Algeria of a heightened risk of violence or kidnapping for Westerners across North Africa and countries bordering the Sahara.
Libya's deputy interior minister has told the BBC that the security problems in the Benghazi do not warrant the Foreign Office response.
Abdullah Massoud told the BBC that the Ministry of Foreign Affairs in Libya had not been told of the change in travel advice for British nationals.
He added that actions like this add to instability in the region.
Yesterday US Secretary of State Hillary Clinton said the Algerian militants involved in the attack on a desert gas plant had weapons from Libya.
"There is no doubt that the Algerian terrorists had weapons from Libya. There is no doubt that the Malian remnants of AQIM have weapons from Libya."
AQIM - Al Qaeda in the Islamic Maghreb - is an affiliate of al Qaeda.
Hillary Clinton was testifying before the Senate Foreign Relations Committee about the September attack by Islamist militants in which the US ambassador and three other Americans were killed in Benghazi.
Air Malta has cancelled its flights to Benghazi on Thursday following the Foreign Office's advice for Britons to leave.
In a statement on the website the airline said:
British nationals have been advised to leave Benghazi in Libya, just a week after four Britons were killed in a terrorist attack in In Amenas, Algeria.
Foreign Office minister David Lidington, told the BBC that the risk of terrorism in the region has been ongoing for some time but that the Foreign Office would not issue its current advice to leave if there were not serious reason to do so.
Latest ITV News reports
The Foreign Office urged British nationals to leave Benghazi in Libya "in response to a specific, imminent threat to westerners".