There are no legal ground for a possible ban, said the mayor, who announced the call to prayer outside the mosque.

The project advocated by the Islamic Center, which runs the mosque five times a day to invite the faithful Muslims to prayer.

According to the mayor, a study of possible noise pollution showed that this call wouldn't exceed 40 decibels, which is the sound level of a radio or birds, he says.

"Skin color, origin, gender or different religions do not play any role [in such decisions]," said the mayor, who added that it's good as it is.

The mosque of this town of more than 28,000 residents, 100km from Hamburg, is the biggest in the Schleswig-Holstein region, with two minarets 26m high. It was inaugurated in the fall of 2009.