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.
The 19-year-old suspect appears to have been planning to kill Jews for several weeks - apparently motivated by the Middle Eastern conflict - which is why he chose this location, the prosecutors said in a statement.
Police arrested the suspect, whose hands and trousers were smeared with blood, shortly after the stabbing on Friday evening.
He was found to be carrying a prayer rug, a Quran, a note with verses from the Quran dated the previous day, and the suspected weapon in his backpack, which suggests a religious motivation, the prosecutors' statement said.
The 30-year-old Spanish tourist underwent emergency surgery after sustaining injuries to his neck and was placed in an induced coma, the statement added, although he was no longer in a life-threatening condition.
Campaigning for Sunday's election has been marred by a series of high-profile attacks in which the suspects are from migrant backgrounds, shifting the focus away from Germany's ailing economy and boosting support for the far-right Alternative for Germany. Opinion polls show the AfD is on track to secure second place behind the conservative CDU/CSU bloc.
A January stabbing in which two people were killed, including a toddler, was blamed on an Afghan immigrant, prompting the CDU/CSU bloc to break a taboo on cooperating with the far-right to push a motion cracking down on migration through parliament with the AfD's support.
In December, a man who had lived in Germany for years, and whose social media posts indicated he sympathized with the AfD, rammed a car into a Christmas market, killing six and injuring hundreds.
The Holocaust memorial, one of the German capital's most sacred sites, commemorates the six million Jews murdered by Adolf Hitler's Nazis during World War Two, one of the darkest episodes in human history and a continuing focus of German historical atonement.
Interior Minister Nancy Faeser of the center-left Social Democrats, who have been accused of not doing enough for German security, said the perpetrator must be punished with the full severity of the law and immediately deported from prison.
"We will use all available means to deport violent offenders back to Syria," she said. "Anyone who commits such acts and so disgustingly abuses the protection offered in Germany has forfeited any right to remain in our country."
There is, so far, no evidence linking the suspect in Friday's stabbing to any other persons or organizations, prosecutors said.
The suspect, who arrived in Germany as an unaccompanied minor, had no prior criminal record in Berlin and was previously unknown to both the police and the judicial authorities.
He was, however, known to police in the eastern state of Saxony, where he lived, for minor offenses related to general criminal activity, Bild newspaper cited the Saxon interior ministry as saying. The ministry did not reply to a request for comment.
