A woman has been shot by police after she launched a knife attack on bus passengers in the Uccle suburb of Brussels.

At least three people were wounded with a machete, two seriously, while the attacker was taken to hospital with gunshot wounds, according to Belgian media reports.

Radio Télévision Belge de la Communauté Française (RTBF) reported that the attacker had been hit in the arm by police, and been arrested.

The radio station said initial indications pointed to the woman suffering from "psychological disorders".

At this stage, it is not being treated as an act of terrorism.

The incident was met with a large police response, and a secure perimeter has been set up at the scene.