Islamic State militants claimed responsibility for Thursday's shooting, in which a French policeman was shot dead, via its Amaq news agency, naming the attacker as Abu Yousif al-Belgiki.
"Al-Belgiki means the Belgian but it is a very vague identity," a spokesman for Belgium's federal prosecutor said, adding he had no indication the gunman was from Belgium.
In November, 2015, when Paris was rocked by near simultaneous gun-and-bomb attacks on entertainment sites, two of the 10 known perpetrators were Belgian citizens.
(Reporting by Robert-Jan Bartunek, editing by Robin Emmott)
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