Agencies contributed to this report
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Spies leak classified information about Turkish energy imports to foreign company
The spies reportedly leaked classified information about Turkish energy imports to a foreign energy company.
Agents in Istanbul have arrested Amal Ozturk, the alleged leader of the cell. Ozturk, a deputy general manager in a private energy company, was arrested on charges of political and military espionage, Sabah reported.
It is claimed that Ozturk passed confidential information to a partner who worked in the service of foreign intelligence agency.
Turkish intelligence had been monitoring the spy cell since April.
The news comes at a time of heightened tensions in the Mediterranean between Turkey and its neighbours Greece and Cyprus.
Turkish President Recep Tayyip Erdogan said Saturday that a vast natural gas field discovered in the Black Sea was even bigger than first estimated.
In August, Turkey said it had found gas reserves of 320 billion cubic metres (11.3 trillion cubic feet), a discovery that could help wean it off imported energy.
But on Saturday, Erdogan, who was on-board a drilling ship in the Black Sea, said the field was now 405 billion cubic metres, and that gas from the site could start being pumping into people's homes in 2023.
Read more: Turkey hits out after rivals Egypt, Cyprus and Greece unite in gas row
Ankara has said that the Black Sea find will not however deter it from exploring in the eastern Mediterranean, despite accusations from neighbouring Greece that its longtime rival is violating maritime borders.
Turkey this week resumed exploration in disputed areas of the Mediterranean, defying calls from fellow NATO members including the United States to withdraw.
Erdogan said Saturday that Turkey was "determined to defend its interests" in the Mediterranean but did not want to "encroach on the rights of others".