Unknown vandals painted a swastika Wednesday on one of the doors of a mosque in Germany, according to a Muslim group.
Turgut Ulker from Turkish-Islamic Union for Religious Affairs said similar attacks on mosques in Dortmund were carried out last month.
These have increased recently and are worrisome to the Muslim community.
Ulker demanded authorities take urgent action and protect places of worship.
Police examined the mosque and covered the swastika with spray paint.