The plan was to gun down law officers in Belgium’s streets or at police stations, possibly disguised in police uniforms themselves…

On Friday a Western intelligence official warned of Islamist terrorist sleeper cells that may be activating across Europe.

And overnight, police fanned out across Belgium in 12 raids, where they arrested 12 people in various cities, including the capital, Brussels, van der Sypt said. They got everyone on their list…

The current potential for new attacks could involve up to 20 sleeper cells of between 120 to 180 people ready to strike in France, Germany, Belgium and the Netherlands, said the intelligence source, who spoke on condition of anonymity.