MADRID: Spain urged the United States on Monday to give details of any eavesdropping, saying new reports of mass telephone surveillance in the country would be “unacceptable” if proven to be true.

The Spanish foreign ministry said it delivered the message to the US ambassador to Spain, James Costos, just hours after the publication of a leaked document purportedly showing that the US security services tracked 60.5 million Spanish telephone calls in a single month.

According to the leaked document published in Spanish newspaper El Mundo, the National Security Agency tracked the origin and destination of the calls and their duration.

Journalist Glenn Greenwald, who jointly authored the article, said he had access to the previously secret documents obtained by former US intelligence contractor Edward Snowden.

The reported spying in Spain adds to a gathering scandal over US eavesdropping on ordinary citizens and world leaders, including German Chancellor Angela Merkel, whose calls may have been intercepted as early as 2002, according to the German press.

The graph published in El Mundo showed the daily volume of calls traced in the 30 days to January 8, 2013. Initials at the top of the page included DNR, or dialed number recognition, according to the article.

The NSA tracked the origin, destination and duration of telephone calls – a criminal offence in Spain without the proper legal authority – but not the content, the paper said.

One a single day, December 11, the NSA tracked more than 3.5 million calls on Spanish soil, the peak in the 30-day period covered by the graph.

Prime Minister Mariano Rajoy said last week he had no evidence that Spain had been spied but was calling in the US ambassador to seek information.

At a summit last week, the 28 European Union leaders approved a statement which said they valued the relationship with the United States but it had to be based on trust and confidence, especially in intelligence matters.

France and Germany are to lead efforts to reach a new understanding with Washington by the end of this year.

Rajoy had said that for the moment, Spain would not join Berlin and Paris in this effort and reiterated that intelligence issues were the responsibility of national governments, not the EU.