It said the mine had been planted by Kurdish militants.
Yet another Turkish serviceman was killed in clashes with Kurdish separatists in a neighboring province.
The majority of Kurdish militants are based in northern Iraq bordering Turkey, making periodic incursions into Turkish territory.
Turkish Prime Minister Tayyip Erdogan warned earlier Thursday a military operation could be carried out in northern Iraq against militants of Kurdistan Workers' Party (PKK) banned in Turkey.
"We will do everything that is necessary to ensure peace and security in our country," he said.
Six people died and 100 have been confirmed injured following Tuesday's bomb explosion outside a busy shopping mall in Turkey's capital.
No one has claimed responsibility for the attack, but security services suspect Kurdish separatists based in southeast Turkey, according to NTV. The channel said the device contained plastic explosives similar to those used by Kurdish rebels in the past.
Two suicide bombers, who plotted terrorist attacks in Turkey, were detained in the country's southern city of Adana, and southeastern city of Mardin, Turkish media reported Wednesday.
Police sources said that a man detained in Mardin had an explosive belt with him consisting of A-4 explosives, which he planned to set off in a crowded place, was also a PKK member.
It was reported Thursday that a woman suicide bomber who had been detained had planned to blow up a section of the Baku-Tbilisi-Ceyhan oil pipeline.
National newspaper Milliyet quoted a source in the Turkish security services as saying the Kurdistan Workers' Party, a militant group that aims to unite parts of Iraq, Syria and Turkey to create an independent Kurdish state, smuggled the A-4 plastic explosives to Turkey from their base in Iraq.
Kurdish separatists blew up a bus stop at a Turkish Mediterranean resort in September last year, killing ten people. Turkey's worst terrorist attack in recent years was a 2003 bombing of the British consular building, a bank, and two synagogues in Istanbul, which killed 58.
The attack threatens to destabilize the political situation in Turkey, which will hold general elections on July 22.
Gen. Yasr Buyukanit, Army chief of staff, said in mid-April it was necessary to carry out a military operation against Kurdish insurgents in northern Iraq.
Prime Minister Erdogan said Ankara insisted Iraq meet its demand to crack down on the Kurdish separatists based in northern Iraq.
Over 37,000 people have been killed in the conflict between Turkey and the PKK, which has been fighting for a so called independent Kurdistan in the southeast of the country since 1984.
Turkish authorities are categorically refusing to open dialogue with the separatists and are determined to use force to eliminate the PKK.
