Turkey is demanding an explanation from the United States over a media report that said Washington spied on Turkish leaders.
Deputy Prime Minister Bulent Arinc said on September 1 that the Foreign Ministry summoned the U.S. charge d'affaires, currently the senior American diplomat in Ankara, "to demand an explanation."
The German magazine "Der Spiegel" reported on August 31 that the U.S. National Security Agency (NSA) had been conducting extensive electronic surveillance of Turkish leaders since 2006.
It said its report was based on documents released by fugitive former NSA contractor Edward Snowden.
Turkey had reacted angrily to a previous report by "Der Spiegel" that said Germany had been spying on NATO ally Turkey for years.
"Der Spiegel" said the United States and Turkey had cooperated closely on intelligence gathering, particularly on Kurdish militants in Turkey's southeast.