A grass fire at or near London Heathrow causes disruption to airport operations, with the runway closed as crews respond to the blaze. Multiple flights are delayed or suspended as a result of the closure, affecting departures and arrivals for travelers at the time of the incident. Reporting indicates the incident occurs in the evening, with airport services altered while firefighters work to bring the fire under control and ensure conditions are safe for aviation activity. The runway closure remains in place during the response period, leading to delays that ripple across flight schedules. The sources describe the situation as likely to cause significant travel inconvenience for passengers, reflecting the operational impact of a fire-related shutdown. Details such as the fire’s exact location, the extent of damage, and whether anyone is injured are not provided in the supplied reports. Further updates depend on the outcome of the emergency response and the airport’s clearance to resume normal runway operations.