AfD distributed a photo of Magnitz lying on a hospital gurney, showing a bloody, gaping wound on his head and his right eye bruised and swollen. The Bremen office of the AfD praised Magnitz's rescuer for his "courageous intervention" and suggested he saved the politician's life.
Magnitz was rushed to the hospital on Monday night after suffering a serious head injury following a "politically-motivated attempted assassination", Bremen AfD in a statement, posting a graphic image of the injured chairman.
Police are searching for men, who knocked down and beat the leader of Bremen's branch of the conservative Alternative for Germany, lawmaker Frank Magnitz, following a recent string of attacks against his party in the Eastern state of Saxony, including a blast outside their office in Doebeln last week. He has said he formerly supported the party of the current Chancellor Angela Merkel, the Christian Democratic Union, but he changed allegiances over her immigration policy.
AfD said police and the Bremen prosecutor's office were investigating the attack. As specified in the ADG, all three of the attackers were hidden under masks.
He added on Twitter: "Hopefully the police will succeed in catching the perpetrators quickly".
Foreign Minister Heiko Maas, a center-left politician who has been a strong critic of AfD, tweeted that "violence must never be a means of political confrontation - no matter against whom or what the motives are".More news: Iran's foreign ministry confirms arrest of former USA sailor
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"Anyone who carries out such a crime must be punished".
The party is expected to make gains in European elections in May and three regional polls in the former communist east later this year.
Picture taken on October 5, 2017 shows Frank Magnitz, politician of the anti-immigration populist party Alternative for Germany (AfD), posing at the Bundestag (lower house of parliament) in Berlin. Three suspects were detained.
Police said Magnitz was on his way home from a New Year's reception at a local newspaper when the attacked occurred.
Party co-chiefs Alexander Gauland and Alice Weidel called the latest assault the "result of the incitement to hatred by politicians and media against us". He wished Magnitz a quick recovery.
"There is no justification for violence even against the AfD", Greens lawmaker Cem Ozdemir wrote on Twitter.