The British embassy in Cairo is closed for what appears to be security reasons.
Officials said they would not disclose any details due to "the sensitive nature of the matter", but reports emerged of plans by militants to "target foreign embassies".
Meanwhile, the US embassy in Cairo, which is located on the same street as the British embassy, remains open.
Reports have surfaced that the closure of the British embassy in Cairo today could have been because of plans by militants to "target foreign embassies".
The embassy has declined to give details of the security concerns that led to it closing its doors today due to "the sensitive nature of the matter " but speculation has been mounting as to why it was shut.
An anonymous source told Reuters that a suspected militant who was recently detained by Egyptian authorities had confessed to planning to target foreign embassies.
The British Embassy in Cairo has said they are working with Egyptian authorities to reopen its doors after suspending public services for security reasons.
No further details as to why the embassy has been shut have been released because of the "sensitive nature of the matter".
A message on the foreign office website reads: "Please do not come to the embassy building."
The British Embassy in Cairo has suspended its public services for security reasons today.
The office of the British Consulate-General in Alexandria will continue operating as normal.
Hundreds of journalists are to protest In London later today over the jailing in Egypt of colleagues from Al Jazeera which has provoked outrage around the world.
Staff from the BBC and other news organisations will hold a one minute silent protest outside New Broadcasting House in London at 9.41am-the time of yesterday's sentencing.
Australian-born Peter Greste, Canadian-Egyptian Mohammed Fahmy, and Egyptian producer Baher Mohammed were each sentenced to seven years in prison over alleged terrorism charges.
The imprisonment of the journalists on charges relating to terrorism provoked Foreign Secretary William Hague to summon the Egyptian ambassador in London for a meeting yesterday.
A bomb in Cairo has wounded at least three people near an election event in support of Egyptian presidential candidate Sisi al-Ahram, state-run newspaper Al-Ahram said.
A man reportedly threw a home-made device in the direction of Sisi's supporters. Sisi was not present at the rally.
The Foreign Office has updated its travel advice in light of recent bombings in Egypt surrounding the third anniversary of the 2011 uprising:
25 January is the 3rd anniversary of the 2011 revolution. A number of groups have called for demonstrations to mark the anniversary.
Protests and disruption to travel around the country are likely in the days before and after 25 January.
You are strongly advised to stay inside during this period in Cairo.
Across the country you are also advised to take particular care in the vicinity of government buildings, and to avoid all demonstrations and large gatherings.
A fourth explosion has gone off in the Egyptian capital, killing one person, the Associated Press reports.
BREAKING: Egypt state TV says 4th explosion has gone off near movie theater in capital, 1 dead.
Protesters supporting the Egyptian army have taken to the streets of Cairo after the capital's police and state security buildings were targeted in three separate bombings, which killed at least five people and injured dozens.
A third explosion has been reported outside a police station in Cairo, hours after a car bomb killed at least four people and a second explosion in the Egyptian capital killed a police officer.
There were no immediate reports of casualties from the third blast, which was heard in the Talbeya neighbourhood in the suburb of Giza.