Thomas da Silva added: "A man with a machete attacked soldiers on patrol in Brussels centre, now shot dead".
Reports say he shouted "Allahu Akbar", which is Arabic for God is greatest, during the attack.
In March 2016, bombers detonated explosives at Brussels Airport and at a Metro station in the city, killing 32 civilians and putting the city on lockdown. Authorities reportedly treated that situation as a terrorist incident.
Belgian media reported earlier on Saturday, citing Belgian Interior Minister Jan Jambon that the perpetrator was a Belgian citizen of Somalian origin.
"The police said he had been shot by soldiers".
After witnessing today's attack, Ryan MacDonald wrote on Twitter: 'Sound of gunshot, heavy police presence outside on Boulevard Emile Jacqmain, Brussels'.
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The man was shot by soldiers on a street in the city centre.
Military in Brussels used a weapon against men who attacked them with a knife.
As the attack appeared to be an isolated incident, Brussels Mayor Philip Close said there would be no change to the country's terror alert status, already just one off the maximum level. Jambon said that the Belgian national has committed some "acts of vandalism " in the past but was not known or preparing acts of terrorism, extremism or radicalism.
An eyewitness in the London attack, Kiana Williamson, said she saw police officers trying to wrestle a man out of a vehicle that had stopped near the palace, one of the city's main tourist attractions and the London home of Queen Elizabeth 11.
A spokeswoman for the federal prosecutor said "the suspect is dead" in the clash Friday night.
The attacker, according to state TV channel RTBF, cried "Allahu Akbar" at the moment he launched the attack. "Our security services stay vigilant and we monitor the situation closely", he said.