Authorities in the US state of Ohio have threatened to arrest anyone who does not leave an evacuation zone near the smouldering wreckage of a train derailment near the Pennsylvania state line, warning that there was a high probability of a toxic gas release.
    While crews were working to prevent a major explosion on Monday, residents were packing overnight bags, loading their pets into cars and searching for hotel rooms. Police in the town of East Palestine moved out of their communication centre as the threat of an explosion increased.