London's Heathrow Airport shuts terminal as emergency services deal with an incident

One of the four terminals at London's Heathrow Airport that was evacuated earlier on Monday over what authorities called a "possible hazardous materials incident" has now reopened after it was declared safe, the airport said in an update.

Heathrow - Europe's busiest airport - apologised for the disruption, saying on social media platform X that it was "doing everything we can" to ensure all flights depart as planned.

Separately, a spokesperson for the London Fire Brigade said that it was standing down its response to the incident.

The British airport's Terminal 4 - serving both European and long-haul routes - was shut temporarily on Monday evening as specialist crews from the brigade were deployed to carry out an assessment.