The cause of the blast was not known.
Turkey said that courts have placed 32,000 suspects under arrest on charges of links to a group run by the US-based preacher.
Russian warplanes on Tuesday flew a bombing run from an Iranian airstrip against jihadist groups in war-torn Syria.
Turkish President Erdogan and his Russian counterpart Vladimir Putin hold their first meeting after Ankara's downing of a Russian warplane.
Kazakhstan's President Nursultan Nazarbayev vowed to send anyone linked to US-based preacher Fethullah Gulen back to Turkey.
Turkey's ambassador to Kazakhstan warned Kazakhstan over its schools linked to US-based preacher Fethullah Gulen.
Israel advised its citizens to leave Turkey citing the potential for jihadist attacks.
Syria's brutal five-year war has turned increasingly messy tangle of internal and external players with their own multi-faceted agendas.
Turkish Internet servers are suffering a powerful cyber attack from abroad, slowing banking services and fanning fears.
Turkey insists it is not dependent on Russia to build its first nuclear power plant amid uncertainty over the $20 billion project.
Turkey on Monday sent back to Russia the corpse of a pilot killed when his plane was shot down by the Turkish air force for allegedly violating its air space on the Syrian border.
The European Union and Turkey agreed on a deal to stem the migrant crisis, including a three-billion-euro ($3.2-billion) aid package for Syrian refugees in Turkey.
Moscow slapped sanctions on Ankara as the war of words over a downed Russian warplane escalated, with Turkish strongman Recep Tayyip Erdogan warning Russia not to "play with fire".
Secretary of State John Kerry spoke by phone with Russia's foreign minister and urged a de-escalation of tensions after Turkey shot down a Russian warplane near the Turkey-Syria border.
President Recep Tayyip Erdogan sought to play down tensions with Russia after Turkey's downing of a Russian warplane on the Syria border sparked fears among NATO allies of a wider conflict.
NATO chief Jens Stoltenberg said that the military alliance stands by key ally Turkey after it shot down a Russia fighter jet on the Syrian border but urged both sides to try to calm the crisis.
Russian Foreign Minister Sergei Lavrov recommended against Russians travelling to Turkey and cancelled his own planned visit after Ankara shot down a Russian fighter jet.
European Union president Donald Tusk called for calm after Turkey, a candidate for membership of the bloc, shot down a Russian war plane on the Syrian border.
Greek Prime Minister Alexi Tsipras held talks with the Greek orthodox patriarch as he embarked on his first official visit to Turkey set to be devoted to grappling with the huge flow of refugees entering his country from Turkish territory.
Turkish President Recep Tayyip Erdogan asked Prime MinisterAhmet Davutoglu to form a new government.
- Middle East & Africa
- Saudi Arabia
- United States
- cyber attack
- Islamic State