Area Police
Around 50 vehicles have been marked with what appears to be human blood in the German town of Hanau close to Frankfurt, as reported by police.
Automobiles, building surfaces and postboxes were marked, sometimes with prohibited symbols, they reported in a official communication.
Officers say they were contacted late on Wednesday, when a individual observed that a car in the Lamboy neighborhood of Hanau had been covered with a reddish-hued substance.
The substance had been placed in the pattern of a banned symbol, they added.
Officers then located numerous other marked vehicles and residential walls in the surrounding area.
These symbols are illegal in Germany under legislation banning the visible presentation of symbols from the Nazi era.
Law enforcement say preliminary tests show the substance was probably human bodily fluid.
"There is still no indication as to its origin; authorities are not yet informed of any harm in relation with the event," they commented.
Municipal representatives said they were trying "to unravel the mystery" and have requested to the community for tips.
A senior political figure commented the attack rendered him without words and required to be solved quickly.
"This act hits the core of Hanau and reawakens the wounds of the extremist violent incident five years ago," he posted on a platform, mentioning the killing of nine individuals by a shooter targeting individuals of foreign heritage in five years prior.