A person has been hit by a train.
The incident happened at Potters Bar station on the line between Finsbury Park and Welwyn Garden City, resulting in all lines that the station serves being blocked.
There is no estimate as to when the line will reopen, however, Thamelink has said it expects disruptions to remain until at least 12.00pm.
Trains running between Stevenage and London may be delayed by up to an hour, cancelled or diverted via Hertford North.
Great Northern and Thameslink Stations between Welwyn Garden City and New Southgate will not be served, resulting in no service at the following stations:
Hatfield
Welham Green
Brookmans Park
Potters Bar
Hadley Wood
New Barnet
Oakleigh Park
New Southgate
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here