A Syrian refugee arrested over the stabbing of a tourist at Berlin's Holocaust memorial had been planning "to kill Jews", prosecutors said on Saturday, the day before an election which is expected to see a surge in support for the anti-migrant AfD.

German authorities said a Syrian suspect was intending “to kill Jews” when he stabbed a tourist in Berlin on Friday, the latest in a string of attacks by refugees and asylum seekers ahead of a crucial election on Sunday.

Police in Berlin say they have arrested a man suspected in a stabbing attack at the city's Holocaust Memorial that left one man seriously injured.