"Another cowardly act against our policemen. A police officer was injured in an attack near the commissariat. An employee is in a hospital, but not in mortal danger. All our support for the Brussels police," Belgian Interior Minister Jan Jambon said on Twitter.
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According to Belgian newspaper DH, the attacker shouted: 'Allahu akbar' (God is greatest).
"It is too early to say now what the motive was of the attacker. The investigation is underway," a police spokeswoman said.
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The prosecutor's office is investigating the circumstances and ascertaining the motives behind the crime, saying the investigation is being conducted as 'attempted murder in a terrorist context'.
The stabbing occurred amid a two-day visit to Belgium by French President Emmanuel Macron.