Below is a timeline of breaking events in Turkey on Friday. All times in GMT, based on the times Reuters reported the events. Reuters does not vouch for events reported by other media.
2352 - Turkish PM says situation under control, blames Gulen movement, declares no-fly zone over Ankara. A U.S.-based organization close to Gulen earlier denied involvement.
2339 - Bomb hits parliament in Ankara, state-run Anadolu Agency says. Reuters witness hears blast in Istanbul.
2320 - Kerry says emphasized "absolute support for Turkey's democratically elected, civilian government and democratic institutions" in phone call with Turkish foreign minister.
2313 - Group close to U.S.-based cleric Gulen says accusations it involved in coup attempt are "highly irresponsible". Condemns military intervention in Turkish politics, says concerned about safety of citizens. The justice minister earlier blamed Gulen loyalists.
2305 - President Obama says he and Secretary of State Kerry agree that all parties in Turkey should support elected government. Urges restraint, avoidance of bloodshed - White House statement.
2304 - State-run Anadolu Agency says 17 police killed at Ankara special forces HQ; no independent confirmation
2259 - Turkish fighter jet shoots down military helicopter used by coup-plotters over Ankara, broadcaster NTV says.
2251 - Commander of special forces says a group has engaged in treason, they will not succeed. Says military does not condone coup.
2247 - 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.
2237 - 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".
2226 - Two loud explosions heard in center of Turkish capital
2208 - Tanks surround Turkish parliament building, open fire. Gunfire heard at Istanbul airport.
2203 - Turkish justice minister says members of a movement loyal to U.S.-based cleric Fethullah Gulen in the army are behind the attempted coup.
2151 - A military helicopter opens fire over the Turkish capital Ankara, witnesses report an explosion in the capital.
2135 - Turkish state broadcaster TRT goes off air, but later starts broadcasting from London.
2126 - 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 a cellphone video link he says it will meet a "necessary response". He says he is returning to the capital Ankara.
2122 - Turkish PM says on Twitter everything will be done to put down coup attempt, even if it means fatalities. Says sieges are under way at some important buildings, without specifying, but urges people to remain calm.
2118 - Presidential source says president and government are still in power.
2105 - 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.
2102 - Head of Istanbul branch of Turkey's ruling AK Party says soldiers enter party building, told to go.
2058 - Soldiers are inside buildings of Turkish state broadcaster TRT in Ankara, TRT correspondent tells Reuters.
2057 - Facebook, Twitter, YouTube and other social media restricted in Turkey, say internet monitoring groups.
2049 - Turkish presidential source says statement made on behalf of armed forces was not authorized by military command.
2047 - Turkish chief of military staff among hostages taken at military headquarters in Ankara, says state-run Anadolu agency.
2038 - Turkish President Tayyip Erdogan is safe, reports CNN Turk.
2025 - 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.
2002 - 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".
1950 - Gunshots are heard in Ankara, military jets and helicopters seen flying overhead. Helicopters seen overhead in Istanbul.
1929 - Istanbul's Bosphorus Bridge and Fatih Sultan Mehmet Bridge are both closed. Dogan News Agency footage shows cars and buses being diverted.