A dual shooting and stabbing outside the Gare du Nord station in Brussels has left one police officer dead and another injured.
According to local reports, a 29-year-old police officer has died after being stabbed while another officer was shot in the groin.
The attack resulted in a shootout between two other police officers and the alleged attacker.
Brussels police said in a statement that the assailant had since been "neutralised".
A spokesperson for Brussels police said: "One of our patrols was attacked by a man armed with a knife.
"The officers then called for reinforcements. A policeman from another patrol used his firearm to neutralize the attacker. The two injured detectives and the assailant were taken to hospital."
The assailant had previously announced his intent to attack police, according to local media sources.
A spokesperson for the Brussels regional fire and emergency services said there was "a medical intervention in progress."
They said that emergency response teams were dispatched to a road in the Scaerbeek area of Brussels at approximately 7.15pm today.
Annelies Verlinden, Belgian interior minister, said: "What a terrible drama. This event breaks my heart.
"My thoughts are first and foremost with the loved ones, the members of the police zone, and the entire police force.
"I follow the situation closely and stay in close contact with the mayor, the corps commander, and the police services. This violence is unacceptable."