BERLIN—German Chancellor Angela Merkel's chief of staff requested a meeting with the U.S. Ambassador here after new leaks of documents appear to show the U.S. intercepted Ms. Merkel's phone calls and monitored German government officials.

The documents, which replaced Greece as the top story on some German newspaper front pages Thursday, included a conversation that Ms. Merkel had in 2011 about the eurozone crisis with someone described as her personal assistant.

The documents, published by WikiLeaks, also included a list of telephone numbers of senior German officials whom the online disclosure platform described as targets of U.S. National Security Agency monitoring.

It wasn't immediately possible to authenticate the documents. WikiLeaks has leaked documents in the past that were later authenticated. In June, WikiLeaks published documents appearing to show NSA surveillance of French President Franç ois Holland e.

German news media have played up the leaks, published Wednesday, resurfacing the issue of U.S. surveillance here at a time when much of the media attention has been on the crisis in Greece. Bild, the highest-circulation tabloid, splashed "Here's How the U.S. Eavesdropped on Merkel!" across its front page.

The leaks prompted the head of Ms. Merkel's chancellery, Peter Altmaier, to reach out to U.S. Ambassador John Emerson.

"The chief of the chancellery has invited the American ambassador to a conversation in the chancellery," a German official said in a statement on Thursday.

In Germany, allegations of U.S. surveillance of Ms. Merkel's cellphone first surfaced in 2013 and have weighed on bilateral relations and German attitudes toward the U.S. ever since.

U.S. officials said shortly after those allegations surfaced that an internal review had revealed Ms. Merkel and more than 30 other world leaders had been monitored by the NSA. The White House promised the U.S. wouldn't monitor Ms. Merkel's communications in the future.

A U.S. Embassy spokeswoman in Berlin had no immediate comment on the WikiLeaks documents or the chancellery meeting.

Write to Anton Troianovski at anton.troianovski@wsj.com

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