A newly elected German mayor is fighting for her life today after being repeatedly stabbed at her home - with police taking her teenage adopted son and daughter away for questioning.The attack on Iris Stalzer, 57, mayor-elect of Herdecke near the western city of Dortmund, took place at around noon, said public broadcaster WDR. The politician sustained as many as 13 stab wounds, according to Westfalenpost. She was discovered inside her apartment by her 15-year-old adopted son, according to German outlet Bild, with life-threatening injuries and several stabbing wounds on her stomach and back.Police have reportedly arrested the boy, who told officers that his mother was attacked outside their home by 'several men on the street', the outlet said.It added that he was taken away from the scene in handcuffs for questioning, wearing an evidence-preserving overall. The teenager reportedly called emergency services alongside his 17-year-old adopted sister at 12.40pm, who was present in the apartment when authorities arrived, the newspaper said.She was also questioned in the hours following the attack, according to Der Spiegel, which reported that she had been involved in a previous case of domestic violence in the Stalzer household in the summer of this year.The politician's daughter had used a knife against the 57-year-old, the report said. Stalzer was taken to hospital by helicopter where she is receiving emergency treatment and is said to be in critical condition.Prosecutors and police said in a joint statement their inquiry was looking into every possibility and said: 'Close family involvement cannot be ruled out at the present time.'She was due to take office after being elected as the mayor of Herdecke, in the state of North Rhine-Westphalia, only a week ago.German Chancellor Friedrich Merz condemned the attack as a 'heinous act' and demanded that the crime and its background 'be swiftly clarified'. Officers escort Iris Stalzer's 15-year-old adopted son to a police car The attack on Iris Stalzer, 57, mayor-elect of Herdecke near the western city of Dortmund, took place at around noon near her own home, said public broadcaster WDR Forensic investigators appear at the crime scene at a street in Herdecke after the newly elected mayor was found critically injured in her apartmentGerman police have issued a major alert and a manhunt is reportedly ongoing for the suspects, according to Bild.A rescue helicopter was photographed at the scene in Herdecke, accompanied by emergency services. Police searching for evidence have sealed off the road around her house.Forensic investigators were pictured searching the crime scene at a residential street in Herdecke.A homicide squad is expected to take over the investigation into the attack shortly. The police are urgently appealing to the public for information. It has not yet been determined whether there was a political motive behind the incident. 'The motive for the crime is completely unclear; we are investigating all avenues,' said police spokesman Tino Schäfer. The motive is unclear but the case raises memories of the 2019 murder of conservative local government president Walter Luebcke, a supporter of then Chancellor Angela Merkel's refugee policy, who was shot dead by a far-right activist as he smoked a late-night cigarette on his terrace at home.Stalzer, of Germany's centre-left Social Democratic Party (SPD), the junior party in the country's conservative-led national government, was elected on September 28 as mayor of Herdecke.After securing just over 52.2 per cent of the vote, she celebrated her success in a post on Instagram, writing: 'Above all, I would like to thank the citizens of Herdecke for this fantastic result and the trust you have placed in me as the new mayor.'I will begin my term in November – full of joy, enthusiasm, and respect for this task. Together with you, I want to shape, develop, and keep our city vibrant.'