The number of illegal Tunisian immigrants leaving home country has reached 4,000 so far this year, Lorena Lando, Chief of Mission of International Organization for Migration (IOM) in Tunisia, said Wednesday.

"Immigration requires a whole system of governance from all countries and their governments," Lando said on the sidelines of the ninth International Forum of NGOs in official partnership with UNESCO held in Tunisia.

"Immigration is not be a problem in the medium to long term, but it is a challenge that leads to increasing coordination and good management of all the countries concerned," said Lando.

Abdelbasset Ben Hassen, head of Arab Institute for Human Rights, warned that "immigration is now turning from a source of diversity and wealth into conflict linked to extremism."

Hassen believes "the politicization of this social phenomenon has only fueled radical discourses that will incite hatred. Marginalization and social exclusion are the key factors that fuel these discourses."