European leaders have pressured the US and Denmark over allegations that the two countries collaborated to spy on European leaders, including German Chancellor Angela Merkel.

From 2012 to 2014, Denmark's Defence Intelligence Service (FE) coordinated with the US National Security Agency (NSA) to obtain intelligence, according to Danish television DR.

Mrs. Merkel is one of the people who want answers.

FE and the NSA have yet to respond.

Trine Bramsen, Denmark's defense minister, would not confirm or refute the claim, but told AFP that "systematic eavesdropping on close allies is unacceptable." During the alleged snooping, she was not in charge of the ministry.

After speaking with Ms. Merkel, French President Emmanuel Macron stated, "This is not acceptable between allies, much less between allies and European partners."

Mrs. Merkel said she agreed with Mr. Macron's remarks, but that the Danish defense minister's rebuke reassured her.

Other officials from Germany, France, Sweden, and Norway were allegedly subjected to surveillance. These countries have also demanded explanations.

"It's intolerable if nations with strong allied cooperation feel the need to spy on one another," Norwegian Prime Minister Erna Solberg told public radio NRK.