Politikilder oplyser til internationale medier at Salah Abdeslam, som mistænkes for at være blandt dem som stod bag terrorangrebene i Paris den 13. november 2015, er arresteret under en politiaktion i Bryssel-bydelen Molenbeek.
Abdeslam blev såret i benet under operationen.
This has not been officially confirmed. Shots were earlier heard in the Molenbeek area of Belgium’s capital.
Belgian PM Charles Michel had to urgently leave an EU-Turkey summit in Brussels, a BBC reporter says.
Arrestationen fandt sted kort tid efter en anden antiterroraktion i den belgiske hovedstad.
One man – identified as Algerian national Mohamed Belkaid and linked to the Paris attacks – was shot dead during the raid in the southern Forest suburb.
Officials said they believed as many as two other suspects may have escaped.