Belgian police said they detained a man who held about 15 people hostage in a supermarket on Tuesday evening in the Brussels suburb of Forest, adding that nobody was harmed.
Belgian public broadcaster RTBF said the man was armed with a knife. Another state broadcaster, VRT, said the incident might have been related to a failed robbery attempt.
It was not immediately clear if the man had surrendered or been overpowered.
There was no suggestion from police that the hostage-taker had Islamist links. Suicide attacks claimed by ISIS killed 32 people in Brussels in March.