Turkey has arrested 6,000 people after a failed coup, with President Erdogan vowing to purge state bodies of the "virus" that caused the revolt.
Mr Erdogan's top military aide Col Ali Yazici is among those now in custody.
The overall death toll for the weekend violence has risen to 290, the foreign ministry said. More than 100 of those were participating in the coup.
Security forces are reported to have met resistance from some coup plotters who were being arrested.
Warning shots were fired at Istanbul's second largest airport, and also at a military base in central Konya province, foreign media reports.
"We will continue to cleanse the virus from all state institutions, because this virus has spread. Unfortunately like a cancer, this virus has enveloped the state," Recep Tayyip Erdogan told mourners at a funeral in Istanbul for victims of the coup.
Mr Erdogan broke down in tears while speaking at the funeral of a close political ally, his campaign manager Erol Olcak, and his teenage son. He said he would take the country forward in "unity and solidarity".
The president repeated an accusation that cleric Fethullah Gulen was behind the plot, and called for him to be extradited from the US. Mr Gulen strongly denies any involvement.
Emotions are running high as funerals for those killed during the coup plot are held. President Erdogan was among those mourning in Istanbul for the brother of one of his closest advisers.
"My glorious nation has given the best response to the coup plotters," Mr Erdogan said in a televised speech frequently interrupted by chants of "God is Great!" Whenever he made a reference to Fethullah Gulen, the roar of boos would come from the crowd.
Turkey has been through a dramatic 48 hours, on a scale even this country - with a turbulent past of three previous coups and a further two military interventions - had never seen before. And it is not totally over yet.
As more than 6,000 have been detained and the expectation that numbers could rise further, one Twitter user commented "this is an opportunity for the governing party to cleanse out all opposition to the presidential system".
Mr Erdogan's critics wonder if he could he make use of the latest events as leverage to push harder for a constitutional change that would further enhance his powers.
People are rallying in cities including Istanbul and Ankara, to show support for the government.
Mr Erdogan told a crowd that Turkey would consider reinstating the death penalty. He said: "In democracies, decisions are made based on what the people say. I think our government will speak with the opposition and come to a decision.
"We cannot delay this anymore because in this country, those who launch a coup will have to pay the price for it."
Capital punishment was abolished in 2004 as part of Turkey's bid to join the European Union. Nobody has been executed in the country since 1984.
Among the latest arrests to be reported was the commander of Incirlik air base in the south used by US-led coalition jets for raids against the so-called Islamic State group in Iraq and Syria. Unnamed officials said Gen Bekir Ercan Van and 10 other soldiers had been detained for their role in the coup.
Also on Sunday, more than 50 senior soldiers were detained in the western province of Denizli, including the garrison commander.
Those arrested on Saturday were reported to include Gen Erdal Ozturk, commander of the Third Army; Gen Adem Huduti, commander of the Second Army; and Akin Ozturk, the former Chief of Air Staff.
One of Turkey's most senior judges, Alparslan Altan, has also been taken into custody.