<p>The International Atomic Energy Agency (IAEA) said an explosion was heard overnight from the new safe confinement, which protects the remains of reactor 4 of the former Chernobyl nuclear power plant, starting a fire.</p><p>The agency said that fire safety personnel and vehicles responded within minutes and no casualties were reported.</p><p>"Radiation levels inside and outside remain normal and stable. IAEA continues monitoring the situation," the agency added.</p>
<p>The International Atomic Energy Agency (IAEA) said an explosion was heard overnight from the new safe confinement, which protects the remains of reactor 4 of the former Chernobyl nuclear power plant, starting a fire.</p><p>The agency said that fire safety personnel and vehicles responded within minutes and no casualties were reported.</p><p>"Radiation levels inside and outside remain normal and stable. IAEA continues monitoring the situation," the agency added.</p>