On Sunday another man with a machete was arrested by police in the eastern Belgian city of Liege.
Other European jihadists heeded the call to travel to Syria.
Two boys from Bradford in the UK posted pictures of themselves online with an AK-47 and pledged allegiance to the Islamic State's Caliph
Bakr Al-Baghdadi. Junaid Iqbal, 16, and Ibrahim Iqbal, 15, posted the pictures to Ibrahim's Facebook page. Their mother left her husband and took her five children, then aged 15, 14, 8, 5 and 3, to Syria last year.
British teenager who was taken to Syria by his mother brandishes an AK-47 in chilling Facebook posts where he pledges allegiance to ISIS and urges Muslims to 'wage jihad in the UK'