Belgian authorities have found signs that the man who set off an explosion at a Brussels train station supported the so-called Islamic State group.
The Belgian prosecutor also said that explosives were discovered at the man's home.
The 36-year-old Moroccan national identified only by the initials O Z was shot dead by a soldier at Brussels Central station on Tuesday after trying to detonate a nail bomb.
"The preliminary results of the search carried out in the residence of the suspect O Z in Sint-Jans-Molenbeek, showed that he probably made the bomb there," Belgian federal prosecutor's spokesman Eric Van Der Sypt said in a statement.
"Both possible chemical substances and materials were found that could serve to make explosives," he said.
"There are also indications that the suspect had sympathies for the terrorist organization IS."
Mr Van Der Sypt earlier told a news conference that the man, who was shot dead by soldiers patrolling the station, had not been wearing a suicide belt and had no history of being a terrorist suspect.
Belgian prosecutor: Man who set off explosion at Brussels train station had no history of being a terrorist suspect https://t.co/9l8918E1zy pic.twitter.com/lL6391KkhE
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The inner city borough has a large immigrant population and was home to some of those involved in attacks on Paris and Brussels in 2015 and 2016 carried out by the so-called Islamic State group.
Interior Minister Jan Jambon said last night's attack could have been much worse because the "big explosion did not happen".
Witnesses said the suspect shouted "Allahu Akbar" (God is Greatest) before setting off the blast, which triggered a small but intense fireball in the station's underground hall.
The bomb consisted of nails and gas bottles inside a bag.
Mr Jambon said police were searching homes in Molenbeek as part of their investigation. He gave no further details on the searches or on why the bomb had not fully exploded.
There were no other casualties apart from the suspect, who was confirmed dead by prosecutors several hours after the attack.
Rail passengers fled the station in the heart of Brussels after the explosion.
Police halted rail traffic, evacuated the site and cleared streets crowded with tourists and residents enjoying a hot summer's evening in the city centre between the station and nearby Grand Place, Brussels' landmark Renaissance town square.
"This is considered as a terrorist attack," federal prosecutor's office spokesman Mr Van Der Sypt told a news conference outside the station.
Belgian Prime Minister Charles Michel told a news conference: "We will not let ourselves be intimidated, we will go on living our lives as normal."
Last night's incident comes 15 months after a series of terror attacks in Brussels which killed 32 people, including one bomb attack on a metro station.
Brussels has been on high alert since those attacks, with troops often visible in crowded places and outside prominent buildings.
