Chernobyl's 30th anniversary on Tuesday came against the backdrop of growing apprehension that nuclear reactors may become a terrorist target.
Serious concern arose during the recent Islamic State attacks in Brussels. Evidence suggested that the assailants were considering a nuclear-related incident. The terrorists had a senior Belgian nuclear official under surveillance, and two former nuclear power plant employees were reported to have joined Islamic State.
This may help explain why Belgian authorities rushed military forces to protect its nuclear plants.