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(Image: CEN)

Police confirmed they are investigating the incident in Ljubljana, Slovenia.

The mosque which is the first to be built in the country is part of an Islamic religious centre.

Mosque officials meanwhile said they want other religious groups including the Catholic Church and the Serbian Orthodox Church, to join them in condemning the desecration of a future religious building.

(Image: CEN)

Police said the investigation is being conducted over incitement of hatred, violence and intolerance on religious grounds, which could carry a two-year jail sentence.

Mufti Nedzad Grabus, the head of the Islamic Community in Slovenia, confirmed in a press release the "heinous act" which he said was noticed by workers in the morning at the site, who then informed the police.

He said: "Regardless of such inflammatory attacks the Islamic religious centre will enrich Ljubljana and all of Slovenia, which in the past showed that it knows how to live in tolerance and that its doors are open to anyone who is well-intentioned and is sincere."

(Image: GOOGLEMAPS) (Image: CEN)

The Ljubljana mosque with its Islamic centre should be completed in a year at a cost of around 35 million EUR (26.5 million GBP).

Qatar donated a third of the funds, and donations and contributions are also expected of Muslims from Slovenia and other countries.