"The individual, whose identity is not yet known, blew himself up in the middle of the football field around 0630 GMT in the morning," Aydin told AFP.
"He was alone in the middle of the field," he added. "Suicide seems the most likely reason for the moment because if he had wanted to cause casualties, the man would have chosen another place at another time."
"It would seem that he is a European in his fifties and a former career military officer," the deputy mayor said.
Troops shoot man after Brussels station blast –police
Contacted by the AFP, the federal prosecutor's Office responsible for terror cases said that it was not responsible for this case, suggesting that police do not believe the incident involves terrorism.
Belgium was hit by jihadist attacks that killed 32 people on March 22, 2016.
An Islamic state terrorist cell was dismantled in January 2015 in Verviers that involved three jihadist returnees from Syria. Abdelhamid Abaaoud, considered the head of the terrorist teams that struck in Paris and Brussels in 2015 and 2016, is suspected of having supervised this cell from Greece.
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