Muslim group seeks protection and end to attacks on places of worship in Dortmund city in North Rhine-Westphalia state. Separately, authorities admit Berlin police falsely accused a young girl during their probe of a racist attack on her.

The mosque, Sultan Ahmet, is run by Turkish-Islamic Union for Religious Affairs in Germany's metropolitan city Dortmund.
The mosque, Sultan Ahmet, is run by Turkish-Islamic Union for Religious Affairs in Germany's metropolitan city Dortmund. (AA)

Attackers have vandalised a mosque in northwestern Germany by painting a swastika on one of its doors, a Muslim body said, and separately, German police admitted its officers botched an investigation over a racist attack targeting a girl from the minority Muslim community. 

"We demand that the authorities take urgent action and protect our places of worship," Turgut Ulker, head of Turkish-Islamic Union for Religious Affairs said on Wednesday, adding, similar attacks on the mosques in Dortmund city in North Rhine-Westphalia state were carried out last month as well.

"We will continue our fight against racism in Dortmund together with all democratic institutions. We will continue to do our best to ensure that Dortmund remains a city of tolerance," he said.

The police examined Sultan Ahmet mosque and tried to cover the swastika with spray paint.

READ MORE: Far-right crimes hit record high in Germany

Racist attack against German-Turkish girl

Also on Wednesday, authorities confirmed a German-Turkish girl who suffered a racist attack at a Berlin tram station, was falsely accused by police of provoking the assault on her. 

Dilan Sozeri, 17, was hospitalised with wounds on Saturday after she was assaulted by six people who also hurled racial slurs and threats at the teen at the Greifswalder tram stop.

After the incident, German police and several media outlets had blamed Sozeri for provoking the attack and blamed the girl for not wearing a face mask and fighting with passengers in the tram.

After she posted a video on Instagram and provided details of the assault, police released a statement acknowledging the officers had goofed up. 

"After further investigation and examination of the video material, it was now possible to determine that the young woman was wearing a face mask while getting on and off the tram," police said.

"Most of the six suspected adults were not wearing mouth and nose covers. Investigations are still ongoing," the statement said.

Suspects released, media cover up

The Berlin police later identified one of the attackers from his previous criminal records and detained three of the suspects.

Reportedly, they were drunk and released after the identification.

Despite the station being crowded, Sozeri said no one stepped up to help her.

Sozeri said the attackers have called her a "filthy foreigner" and "go back where you came from".

She also blamed the German media for trying to cover up the racist attack and displaying it as a mask dispute.

"The (German) press have distorted the facts and have spread lies, I had no other option but to address it in this way," Sozeri said.

German police have long been criticised for lapses and non-seriousness in investigating racist attacks and hate crimes committed by far-right extremists against religious minorities. 

The European country has witnessed growing racism in recent years fuelled by far-right parties, who often exploit fears about the refugee crisis.

READ MORE: Far-right terrorism 'biggest danger' to democracy in Germany - intel chief

Source: AA