Here is how the events have unfolded in the attempted military coup in Turkey.
7.20pm - Istanbul's Bosphorus Bridge and Fatih Sultan Mehmet Bridge are both closed. Dogan News Agency footage shows cars and buses being diverted.
7.50pm - Gunshots are heard in Ankara, military jets and helicopters seen flying overhead. Helicopters seen overhead in Istanbul.
8.02pm - Turkish Prime Minister Binali Yildirim says attempted coup under way, calls for calm. He says a group within Turkey's military has attempted to overthrow the government and security forces have been called in to "do what is necessary".
8.25pm - Turkish military says has taken power to protect democratic order. In a statement sent by email and reported on Turkish TV channels, the military says all of Turkey's existing foreign relations will be maintained.
8.38pm - Turkish President Tayyip Erdogan is safe, reports CNN TURK.
8.49pm - Turkish presidential source says statement made on behalf of armed forces was not authorised by military command.
8.57pm - Facebook, Twitter, YouTube and other social media restricted in Turkey, say internet monitoring groups.
8.58pm - Soldiers are inside buildings of Turkish state broadcaster TRT in Ankara, TRT correspondent tells Reuters.
9.05pm - Turkish state broadcaster says reading statement on the orders of the military - that new constitution will be prepared, accuses government of eroding democratic and secular rule of law, that the country is being run by a "peace council", that martial law imposed, curfew imposed across the country.
9.18pm - Presidential source says president and government are still in power - but Mr Erdogan's whereabouts are unclear.
9.26pm - Turkish President Tayyip Erdogan urges people to take to the streets to protest against what he describes as a coup attempt by a minority faction within the military. Speaking to a CNN Turk reporter via Facetime he says it will meet a "necessary response". He says he is returning to the capital Ankara.
9.35pm - Turkish state broadcaster TRT goes off air, but later starts broadcasting from London.
9.51pm - A military helicopter opens fire over the Turkish capital Ankara, witnesses report an explosion in the capital.
10.03pm - Turkish justice minister says members of a movement loyal to US-based cleric Fethullah Gulen in the army are behind the attempted coup.
10.08pm - Tanks surround Turkish parliament building, open fire. Gunfire heard at Istanbul airport.
10.26pm - Two loud explosions heard in centre of Turkish capital
10.37pm - Commander of Turkey's First Army, part of land forces responsible for Istanbul and other western areas, said those attempting a coup were a small faction and "nothing to worry about".
10.47pm - PM says gangs and illegal formations are behind coup attempt, and calls it a terrorist act. He says government remains in charge. Urges people to take to the streets.
11.04pm - State-run Anadolu Agency says 17 police killed at Ankara special forces HQ; no independent confirmation
11.05pm - President Barack Obama says he and Secretary of State John Kerry agree that all parties in Turkey should support elected government. Urges restraint, avoidance of bloodshed - White House statement.
11.13pm - Group close to US-based cleric Mr Gulen says accusations it was involved in coup attempt are "highly irresponsible".
11.39pm - Bomb hits parliament in Ankara, state-run Anadolu Agency says. Reuters witness hears blast in Istanbul.
11.52pm - Turkish PM says situation under control, blames the Gulen movement, declares no-fly zone over Ankara. A U.S.-based organisation close to Gulen earlier denied involvement.
0.20am - Turkish official says Mr Erdogan's plane lands in Istanbul.
0.27am - Two more explosions hit parliament; member of parliament reached by telephone says lawmakers are hiding in shelters at the parliament.
0.45am - Turkish private broadcaster CNN Turk halts live news broadcast, presenter says soldiers entered studio control room.
0.45am - Around 30 soldiers, part of faction attempting to carry out a military coup, surrender weapons after being surrounded by armed police in Istanbul's central Taksim Square.
1am - Mr Erdogan appears among supporters at Istanbul airport, says uprising has been attempted against solidarity and unity of country; says no power is above national will.
2.05am - Turkey's state-run Anadolu Agency says that 17 police officers have been killed in a helicopter attack on police special forces headquarters on the outskirts of Ankara.
2.15am - The leaders of Greece's armed forces and police are holding emergency meetings in Athens to monitor developments in neighboring Turkey, according to government officials.
2.25am - The military has taken position at the base of the Taksim monument at Taksim Square in Istanbul, occasionally firing into the air to disperse a growing crowd of government supporters.
2.35am - NATO's chief has called for "full respect" for Turkey's democratic institutions and constitution.
3.20am - A top Turkish official says the coup attempt within the country's military appears to have been unsuccessful.
4am - The state-run Anadolu Agency, citing unnamed military sources, says the leader of the attempted coup is Colonel Muharrem Kose.