Turkey demanded an explanation from the U.K. over allegations published by the Guardian newspaper that British intelligence spied on the Turkish delegation led by Finance Minister Mehmet Simsek during G20 meetings in 2009, the Foreign Ministry said today.

The ministry in Ankara expressed “concern” in an e-mailed statement and said it was waiting for a “satisfactory explanation.” If there is any truth in the allegations, it will represent a “scandal” for Britain, the ministry said.