Several European nations , including the United Kingdom , France , Belgium and the Netherlands , are participating in the air campaign against ISIS in Iraq . Neither Belgium nor Greece confirms whether the probe involves a jihadi cell in Verviers . The Belgian federal prosecutor's office said it was investigating an alleged plot to attack police officers and soldiers with explosives. Up to 20 sleeper cells could be set to strike in France , Germany , Belgium and the Netherlands .
Neither Belgium nor Greece confirms whether the probe involves a jihadi cell in Verviers . The Belgian federal prosecutor's office said it was investigating an alleged plot to attack police officers and soldiers with explosives. Up to 20 sleeper cells could be set to strike in France , Germany , Belgium and the Netherlands .