BERLIN German police detonated a suspicious-looking package sent to President Joachim Gauck's office on Friday, a presidential spokesman said.
"A controlled explosion was carried out in the park next to the presidential palace Bellevue. An initial assessment showed it posed a concrete danger," the spokesman said.
The incident came a day after U.S. authorities charged a man with mailing letters to President Barack Obama and a U.S. senator containing a substance that preliminarily tested positive for ricin, a highly lethal poison made from castor beans.
(Reporting by Thorsten Severin, writing by Gareth Jones)