The arrest of an Afghan asylum seeker suspected of killing two people in a knife attack targeting children in a German park has prompted calls for a much tougher migration stance and fired up campaigning for Germany's Feb.

BERLIN—German police detained an Afghan man suspected of stabbing two people to death, including a 2-year-old, putting immigration back at the center of the campaign for next month’s election. Armed with a kitchen knife,

A 28-year-old man from Afghanistan was arrested following a knife attack on Wednesday in a park in the German city of Aschaffenburg in which two people were killed, including a toddler, police and the state health minister said.