Update: @centralline has no service Marble Arch to Liverpool Street due to a person under a train. Severe delays on the rest of the line.
British Transport Police have confirmed a person has died after being hit by a Central Line train at Stratford this afternoon.
Officers were called to Stratford Underground station after reports a person had been struck by a westbound train around 4.15pm.
Despite the efforts of medics, the person was pronounced dead at the scene. Police say they are not treating the death as suspicious and are working to identify the person.
The Hainault loop of the Central line will be closed for a total of 12 days to carry out upgrade work.
The closure will take place from 24 October to 4 November.
London Underground says the upgrade is designed to improve reliability and ensure smoother journeys for passengers.
Minor delays on Circle Line clockwise due to earlier customer incident at Monument.
Service suspended on Central Line between Loughton and Epping due to signal failure at Debden.
Underground station closed on Central Line at Queensway due to staff shortage.
Service suspended on Central Line between Northolt and West Ruislip due to signalling problem at West Ruislip.
It took four days, but four days in, the fears about the fragility of London's public transport network came true.
One of the key tube lines to reach the Olympic Park here was suspended for hours this morning, the delays hitting spectators and commuters alike.
It was the first real test for Londoners still working in the city while the Games go on. It comes as more and more businesses are complaining that the Olympics has actually caused a big fall in trade. Our Olympics Correspondent Simon Harris on the faliure on the Central Line.
Thousands of commuters and Olympic spectators were hit this morning when the Central Line was put out of action across east London during the whole of rush hour.
Services were suspended for three hours between Liverpool Street and Woodford, leaving passengers stranded at Bethnal Green and Stratford.
A driver reported smelling smoke on a train as it pulled into Leyton, one stop north of Stratford.
Meanwhile, the RMT transport union called for an immediate investigation into "the real impact of cuts to fleet maintenance schedules" following the incident.
The union said it was emerging that the likely cause of today's problem was defective brakes seizing up.
Waiting passengers at Stratford are now being told the Central Line will not re-open for at least an hour.
A fire alert means services are suspended on a key section of the line which serves the Olympic Park station.
TfL is advising Olympic spectators to use other Tube and main line services to reach Stratford, including the Underground's Jubilee line, the London Overground and the Docklands Light Railway.