"We wish a speedy recovery to two our colleagues from the Vesdre department who were hurt in a shooting last night," Federal Police tweeted.
Prime Minister Charles Michele and Interior Minister Jan Jambon confirmed this and expressed their support to the officers, their families and friends.
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"My support for two wounded policemen during the shooting. We must be adamant before those who attack law enforcement agencies," he said in a message on Twitter.
According to Belgian TV station RBTF, the police were pursuing a suspicious vehicle. When its passengers spotted the patrol car on the road near a community in the eastern province of Liege, they opened fire.
Ballistics experts found that attackers used large-caliber weapons. The police are actively conducting their search; the identities of the suspects are being established.