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The Central line has been hit with severe delays after a trespasser ran on to the tracks.
Transport for London earlier said that emergency services were dealing with a “casualty on the track”.
However, this has since been updated to a trespasser on the tracks near Leyton.
It is not yet clear how long the disruption will last.
It comes after a fire next to railway lines in south London also caused rail disruption.
The incident in East Croydon blocked lines, causing delays to Thameslink services. It is the second trackside fire in the area in as many days.
The Weaver Line is expected to be suspended between Hackney Downs and Chingford until Thursday as a result of the trackside blaze in Walthamstow, which damaged homes and gardens.
Follow the latest updates below...
Live updates
Rush hour disruption
Disruption continues on the Tube and other train networks this rush hour.
This includes the severe delays on the entire Central line caused by a trespasser on the tracks earlier this afternoon.
The Weaver line also remains closed between Chingford and Walthamstow Central due to a wildfire.
There are minor delays on the Victoria, Piccadilly and Metropolitan lines.
All other lines currently have a good service.
Victoria line update
There are minor delays on the Victoria line due to train cancellations.
Trespasser in Gillingham area
Another trespasser on the line is causing delays on Southeastern services this afternoon.
A trespass incident between between Rochester and Rainham means that the power has been turned off and trains are currently able to run in the Gillingham area.
The disruption is expected until around 6.45pm.
Piccadilly line update
There are minor delays on the Piccadilly line between Acton Town and Uxbridge due to an earlier signal failure at Osterley.
There is a good service on the rest of the line.
Metropolitan line suspended
The Metropolitan line has been suspended between Chalfont & Latimer and Chesham.
This is due to yet another trespasser on the tracks.
The incident occurred near Chesham station.
There are also minor delays on the line between Moor Park and Watford due to train cancellations.
National Rail faces disruption amid hot weather
The National Rail network in London and the south east of England is set for further disruption this week as the hot weather continues.
Temperatures are forecast to hit highs of 30C today and as high as 29C and 28C from Wednesday to Friday.
Conditions are then set to cool slightly as this weekend sees highs of 25C.
Passengers are being advised to plan their journey ahead of travel due to expected disruption.
Heat damaging lines and cables and speed restrictions being put in place can add to travel delays as the heatwave continues.
Tube and Overground delays
As well as the ongoing delays on the Central line, there is disruption elsewhere on the TfL network.
There are minor delays on the Metropolitan line between Harrow-on-the-Hill and Uxbridge and Watford.
The Weaver line remains part suspended between Chingford and Hackney Downs and there are severe delays on the rest of the line.
There is a good service on all other lines.
Central line update
Severe delays on the whole Central line following a trespasser on the tracks near Leyton.
The previous suspension from Liverpool Street has since been lifted.
However, it is not yet clear how long the disruption will continue.
Central line part suspended as emergency services deal with 'casualty on the track'
There is currently no service on the Circle line between Liverpool Street and Leytonstone while emergency services deal with a casualty on the track.
There are severe delays on the rest of the line.
Commuters getting on a Central line trainAFP via Getty ImagesClapham Junction disruption
Travel disruption is expected for some services leaving Clapham Junction until around 4pm this afternoon.
Trains between the station and Watford Junction are affected.
Services were previously suspended due to a points failure.
While lines have reopened, trains are still being hit with delays and cancellations.
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