Bosnian mujahideen (Bosnian: Bosanski mudžahedini) were foreign Muslim volunteers who fought on the side of Bosniaks during the 1992–1995 Bosnian war. They arrived in Bosnia with the aim of fighting for Islam and on behalf of Muslims.
Some of them were originally humanitarian workers (such as Abu Hamza, one of the leaders), while some of them were considered criminals in their home countries for illegally travelling to Bosnia and becoming soldiers. The number of volunteers is still disputed, from around 300 to 6,000. According to the Radio Free Europe research there are no precise statistics dealing with the number of foreign volunteers. In 2006, documents emerged detailing the presence up to 1,700 foreign Mujahideen, mainly from Arab nations. Hundreds were said to have been provided with Bosnian passports. It's thought that there were around 6,000 foreign Mujahideen active in Bosnia throughout the war although precise numbers are still a matter of dispute mainly due to political sensitivities.
Read more about Bosnian Mujahideen: Bosnian War