Belgian police killed a gunman after several officers were wounded on Tuesday in a raid on a Brussels apartment linked to investigating November's Islamist attacks in Paris, public broadcaster RTBF said.
Two other suspects were being sought, it added.
But after five hours of intense police activity in the area, security forces escorted children away from nearby schools and kindergartens and began to allow residents back to homes in the suburban neighborhood, Reuters journalists at the scene said.
Belgium's federal prosecutor, leading the investigation, said one or more suspects barricaded themselves in an apartment after firing through a door at police who arrived to search it. Police said two officers were wounded then and another was hit later. Local media said four police were injured in total.
DH newspaper said one suspect was shot dead after being spotted from a police helicopter in a nearby garden.
French Interior Minister Bernard Cazeneuve said French police took part in the raid in the Belgian capital. Streets around the house in the city's southern borough of Forest were sealed off by police.
"This operation is connected to the Paris attacks," a spokesman for the federal prosecutor said.
Prime Minister Charles Michel met ministers and was expected to give a news conference later.