New leaks detailing NSA spying on European delegations have touched a nerve in Berlin, where politicians are calling for Snowden to be given asylum as questions over what Chancellor Angela Merkel knew about Prism grow louder.

Over the weekend, German weekly Der Spiegel cited documents provided by former intelligence analyst Edward Snowden that purportedly showed that the NSA had spied on European Union offices in Brussels, Washington, and New York. Using data taps and computer hacks, the agency gained access to the EU's computer system, email, and confidential documents, the magazine said.

Separately late Sunday, The Guardian cited a 2010 NSA PowerPoint slide that was said to detail how the U.S. had spied on several of its allies, among them Japan, Mexico, South Korea, India, and Turkey.