Story highlights Search continues for suspects from apartment where gunfire began

Two wounded officers have been released from the hospital, official says

People opened fire on police who had gone to search apartment that was supposed to be empty

(CNN) Belgian authorities searched through the night, looking for suspects who escaped after gunfire interrupted a raid of a building tied to last year's deadly terrorist attacks in Paris.

One suspect died and four police officers wounded in the raid. Belgian police fear that two people are on the run following the operation in Brussels earlier Tuesday, a senior Belgian counterterrorism official told CNN.

A CNN crew arriving at a train station in the Belgian capital noticed a large police presence and heard helicopters over the area where the raid took place.

On Tuesday evening, Belgium Prime Minister Charles Michel told reporters that police operations were ongoing in the neighborhood.

Police went to search a presumably empty apartment Tuesday afternoon in southern Brussels, only to have people inside begin shooting at them, the counterterrorism official said.

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