Five Armenians have been charged in Belgium with corruption, money laundering and other crimes as part of a major international investigation into match-fixing in tennis, Belgian federal prosecutors said Wednesday.
The marchers, most dressed in white, made a solemn procession through the city's sunny streets.
A Brussels court on April 23 sentenced Ayari and Abdeslam to 20 years in prison for trying to kill police officers.
Police were scrambling to unpick the motives of the attacker identified as Benjamin Herman.
The shooting occurred around 10:30 am near a high school on a major artery in the city, which lies some 90 kilometres east of Brussels..
An Iraqi court on Tuesday sentenced a Belgian militant, who threatened Europe in propaganda videos, to death by hanging for membership of the Islamic State group.
A Spanish extradition request for three Catalan politicians who fled to Belgium with former separatist leader Carles Puigdemont was rejected by a Belgian court on Wednesday, the crown prosecutor announced.
The court in the Belgian capital said "there can be no doubt" about jihadist Salah Abdeslam and his co-defendant Sofiane Ayari's involvement in extremism.
The forum was held with the aim of enhancing economic, trade and investment co-operation between the two sides and opening up prospects for communication between representatives of the Qatari and Belgian private sectors.
The Prime Minister of Belgium, Charles Michel, welcomed His Highness the Emir and the official delegation, expressing his delight at the Emir's visit to Belgium.