A suspected jihadist group targeted in a major anti-terror raid on Thursday had been planning to kill policemen in the street and at police stations, Belgian prosecutors say, the BBC reports.
The planned attacks were imminent, they said, adding that two suspects shot dead in Verviers during the raids were still being identified.
Searches were also carried out overnight in the Brussels area.
Thirteen suspects had been arrested, while two were arrested in France.
Guns, munitions and explosives, as well as police uniforms and a large amount of money, were seized during the raids, prosecution spokesman Thierry Werts told reporters.