Belgian police say two female officers have been attacked and wounded by a man wielding a machete and shouting "Allahu Akhbar" outside a police station in the city of Charleroi.

Police in the city said in a message posted on Twitter that the attacker was shot but is still alive. The attack occurred in front of Charleroi police station.

A police officer reached by telephone declined to make further comments.

The attack happened as police in Belgium remain on high alert in the wake of attacks which killed 32 people in March this year.