The attacker launched at the two officers with a knife but they avoided injury thanks to the protective vests they were wearing.
Officials in the Belgian capital said there was no immediate indication the attack was terror-related but the location of the incident will raise fears it was Islamist-inspired.
Update: Assailant is a Moroccan national residing illegally in Belgium, he is known to the police
MZ, the man who, on Wednesday afternoon, assaulted two police inspectors in Molenbeek-Saint-Jean with a knife, is a Moroccan national aged 24 years residing illegally in Belgium. MZ has repeatedly received an order to leave the territory. It is already known to police and justice for flights but not for terrorism. His hearing by the police was still ongoing Thursday night, Brussels prosecutors said.