After attacks, German president says absolute security impossible

German President Joachim Gauck attends a remembrance hour in Bavarian parliament in Munich, Germany, July 31, 2016. REUTERS/Michaela Rehle

MUNICH (Reuters) - No government can guarantee its citizens full security from terror strikes, Germany's president said on Sunday, calling for national unity as the best defence after attacks in the past two weeks left 15 people dead.

"Nowhere on earth are there politicians who can make such a guarantee," Joachim Gauck, a former Christian pastor in communist East Germany, told a memorial ceremony for the attack victims in Munich.