Area Police
Roughly 50 cars have been covered with what appears to be blood from a person in the Germany's municipality of Hanau in proximity to Frankfurt, according to law enforcement.
Vehicles, walls and mailboxes were defaced, sometimes with prohibited symbols, they reported in a official communication.
Police say they were contacted late on Wednesday evening, when a individual noticed that a car in the Lamboy district of Hanau had been marked with a reddish liquid.
The substance had been placed in the form of a swastika, they added.
Officers then found numerous other marked automobiles and house walls in the adjacent neighborhood.
Swastikas are prohibited in Germany under legislation outlawing the public display of symbols from the Nazi era.
Officials say initial examinations show the fluid was probably human blood.
"At present there remains no clue as to its source; investigators are presently not aware of any injuries in connection with the event," they added.
Local authorities announced they were attempting "to unravel the mystery" and have appealed to the public for tips.
A high-ranking political figure commented the vandalism rendered him stunned and had to be addressed promptly.
"This incident affects the core of Hanau and reopens the trauma of the extremist attack in 2020," he wrote on online, referring to the murder of nine victims by a gunman focusing on people of immigrant origin in February 2020.