Officials were insisting the attempted coup was falling apart, and authorities had regained control of the parliament, which was hastily reconvened into session that was broadcast live on television.
A total of 1,563 military officers had been arrested, officials said.
President Recep Tayyip Erdogan had returned to Istanbul airport during the early hours of Saturday, saying the hotel he was staying at on Turkey’s Aegean coast was bombed after he left.
Erdogan appointed General Umit Dundar, commander of the First Army, as acting chief of staff after General Hulusi Akar was captured and taken hostage.
Akar was later rescued, the private TV station CNN-Turk reported.
Prime Minister Binali Yildirim, who has spoken on media via telephone throughout the night, is believed to be in Ankara.
Government-backed jets have downed pro-coup aircraft and bombed tanks surrounding the presidential palace in the capital Ankara.
Dozens of soldiers backing the coup surrendered on the Bosphorus bridge in Istanbul that they had held throughout the night, holding their hands above their heads as they were detained.
Nearly 200 soldiers surrendered at the military headquarters in Ankara on Saturday, the state-run Anadolu news agency reported. An official said special forces were currently securing the complex.
Istanbul authorities sought to make a show of normalization with the bridges reopening to traffic and Ataturk International Airport — which had been shut down by the plotters — gradually reopening.