The Turkish military has declared a state of emergency and closed several media outlets in the country’s largest city Ankara.
The decision came after a coup attempt failed last week in which more than 1,300 people were killed, while dozens of other people have been detained, according to Turkish authorities.
A curfew was imposed in the capital Ankara, with thousands of soldiers deployed in Istanbul and Ankara as well as a police presence in the city centre.
It is not clear how long the curfew will last.
The government has not released the curfew order.
A senior military official said the government was planning to ban television, radio and newspapers in Istanbul as well.
The government has said that more than 40,000 people have died in the military coup, and that it plans to prosecute those responsible.
But the coup attempt also sparked a new wave of protests, which have seen hundreds of thousands of people take to the streets in cities across Turkey.
Many have called for the president to step down and for a referendum on constitutional reform to be held.