The measure, imposed by Turkey president Recep Tayyip Erdogan, enables the president and cabinet to bypass parliament when drafting new laws as well as restrict or suspend rights and freedoms, the BBC said.

Speaking from Ankara, Erdogan insisted that “all the viruses within the armed forces would be cleansed”.

Since last week’s failed coup, thousands of people have been arrested and more than 600 schools closed.

The president and his cabinet will now be able to enforce curfews or restrictions on freedom of publications as well as having more powers of arrest.

The measure has raised significant concerns among critics who have accused him of abusing the emergency to acquire more power for the presidency.

The UK Foreign Office noted the change in advice, but said the situation appeared to be “calming” following the attempted coup.

“The security environment, however, remains potentially volatile,” it added. “Flights to, from and through airports in Turkey are returning to normal, although some disruption remains.”

It said customers should check with their airline or travel company before they travel and “may need to turn up at the airport earlier than normal to get through the additional security checks in place.”