Britons in Turkey have been warned to stay indoors and remain vigilant after the military claimed to have taken control of the country earlier this evening.
In a statement, the Foreign Office said it was 'aware' of the apparent coup, and said it was 'seeking more information'.
It added; "Until the situation becomes clearer, we advise you to avoid public places and remain vigilant."
According to reports, the Turkish military stormed a state TV station earlier this evening, and said in a statement a 'peace council' is now in control of the country, and said there was a curfew and martial law.
Soldiers have been spotted a strategic points in Istanbul and the capital Ankara.
President Recep Tayyip Erdogan has called on residents to gather in the streets to oppose the uprising, and said the government remains in control.
He blamed the coup on 'parts' of the military, and said security forces will 'retaliate in kind', according to reports.
Some 2.5 million Brits visit Turkey every year, and those due to travel there have also been issued advice.
The Association of British Insurers said in a statement: "In light of the coup in Turkey, anyone booked to travel to the country should contact their tour operator, travel agent, or airline for advice. If alternative arrangements are made you should be able to transfer your travel insurance to the new destination.
"You should regularly check Foreign and Commonwealth Office travel advice. Anyone in Turkey should speak to their tour operator or airline for advice."
* If you are worried about the safety of a British national in Turkey, call 020 7008 1500. Those inside the country can call +90 312 455 3344.