Emergency services have raced to Hainault tube station in response to a 'serious incident'.
Several police cars and fire engines have been spotted outside the station in east London this morning.
There have been unconfirmed reports of a multiple stabbing - MailOnline has contacted the Metropolitan Police and London Ambulance Service for comment.
People were seen gathering on the road outside Hainault tube station and a helicopter circling overhead.
This is a breaking news story- more to follow