London City Airport was closed for several hours after an unexploded World War II bomb was found nearby.
Flights resumed after a controlled explosion
Police were alerted when a device was found on a building site at Seagull Lane, Canning Town, in east London.
The area was cordoned off and Docklands Light Railway (DLR) and Silverlink train services in the area were also suspended for a time.
The airport, which is 2.4km away, has reopened, although there may be delays because of the disruption.
Flights began operating again and Silverlink services returned to normal at about 1330 BST.
A controlled explosion was carried out at 1445 BST, after which a full DLR service was able to run.
Luke Hazell, 25, an architectural technician who was working on the building site where the device was unearthed said work stopped at about 0930 BST.
"The project manager came into our building and basically said a bomb had been found," he told the BBC News website.
"We all just took it in our stride and had a laugh about it.
"It's been moved now - they moved it onto wasteland and are going to explode it there."