Overview

• Heathrow confirmed Terminal 4 was shut and cleared as emergency services responded to a reported incident involving potentially dangerous substances.
• The London Fire Brigade said it was called at 17:01 and deployed specialist units from nearby stations alongside fire engines and ambulances.
• Heathrow advised travelers not to go to Terminal 4, other terminals continued operating, and trains were not stopping at the affected station as a precaution.
• Media images showed a column of smoke near the terminal, and officials said no injuries had been reported so far.
• The cause remains under investigation, and the BBC reported some Terminal 4 flights were still listed as operating within the next two hours.