This is on the homepage of the London City Airport site tonight:
Following the discovery of a World War Two ordnance in King George V Dock as part of planned development works, a 214m exclusion zone has been implemented as a precaution by the Met Police. As a result, London City Airport is currently closed.
All passengers due to travel from London City on Monday are advised to contact their airline for further information. Passengers are advised not to travel to the airport until further notice.
The airport is cooperating fully with the Met Police, Royal Navy and London Borough of Newham.