Idriz Bilibani, "MA in Islamic Studies from Prizren," has been described as "the main organizer of departure of Serbian citizens to the religious war in Syria."

There, they fight on the side of Islamic State, according to a report in the Belgrade-based newspaper Blic.

"According to the most recent data of security services about the terrorist organization ISIS, professor of Sharia law Idriz Bilibani, also known as Sheik, used, together with Denis Hadzic from Novi Pazar, the space for prayer in the Furkan mosque in Novi Pazar for preaching radical Islam," said the article.

The pair "called for jihad, a holy war, and called on people to join the war in Syria by fighting against the forces of legitimate President Bashar el-Assad."

"The masjid Furkan in Novi Pazar is not a recruitment center for joining the Syria war, but it is a place where one can establish contact with people fighting on the side of ISIS," a source with knowledge of the Serbian security services' data on "fighters in Syria" told the daily, and added: "No weapons were ever found in those premises, but it is used to spread radical interpretations of Islam. And it is certain that all those who left Serbia to join the war in Syria had been to Furkan."

Idriz Bilibani was arrested in Kosovo last September and released a month later. He was placed under house arrest on October 16. Bilibani last time posted a message on his Facebook account, which has more than 3,400 followers, last December.

"According to security services, about 20 Serbian citizens went to fight on the side of Islamic State in Syria. Some took their whole families with them and settled there. There is the so-called Balkan Brigade in ISIS that fights in Syria and Iraq," the paper writes, and adds that all Serbian citizens who "went to jihad" are members of this brigade.

"There have been several people from Sandzak who first sold their houses, and even took out bank loans, and went to the Syrian battlefield. They leave their families in Syria, while males go to fight for up to six months. All of them left individually, without organized transport, but they knew exactly where to go: via Turkey to the border with Syria," the paper said, adding that these jihadis would then be received in the city of Kilis.