Germany spying: US envoy summoned after arrest
5 July 2014 Last updated at 04:19 BST
The German foreign ministry has summoned the American ambassador to ask for what it called a "swift clarification" following the arrest of a German man suspected of spying for the United States.
Local media says the suspect was an employee of Germany's foreign intelligence agency, who worked as a double agent for two years.
Emily Thomas reports.