A flight from Munich, Germany to Newark was forced to divert to London Heathrow after several passengers became unwell and started feeling light headed.
Flight UA-31 left Munich at 9:30am local time and was scheduled to arrive in Newark at 12:50pm local time.
But, after several passengers complain of feeling unwell, the crew of the Boeing 767 diverted to London (LHR), safely landing at 11:05am.
Emergency services met the aircraft on arrival in London where EMTs boarded the aircraft and assessed the sick passengers.
All passengers have been de-planed and assessed for illness and will be accommodated to hotels overnight.
It is still unclear what caused several people to feel unwell.