Previous arrests
Several other people have already been arrested in Spain, Morocco and Saudi Arabia as part of the probe, according to Belgian officials.
The investigation was conducted in collaboration with several countries and Eurojust, the European Union’s judicial co-operation unit.
Europe has been on high alert for several weeks over heightened fears of attacks.
Western security officials have warned that al-Qaeda may be planning attacks in Europe similar to those that struck the Indian city of Mumbai in 2008.
In October, the United States issued a travel alert for its citizens travelling in Europe, citing the risk of potential attacks on transportation systems and tourist attractions.
Similar alerts were issued by Japan, Sweden, Britain and France.
A plot to blow up cargo planes was uncovered at the end of last month after explosives-laden parcels were found at airports in Dubai and Britain.
Source: Agencies
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