Following earlier trespassers on the railway between Finsbury Park and Alexandra Palace, all lines between these stations have now reopened.
As service recovers, trains running between these stations may still be delayed by up to 20 minutes.
This incident is expected to continue to impact services until 18:00.
Great Northern / Thameslink customer advice:
This incident is disrupting Great Northern and Thameslink services, and they are working to get more information for you.
Your journey is likely to be disrupted, but there isn't an exact estimate for any delays at the moment.
You'll be able to see any further updates on this page, so please continue to check back here.
If you need to use another route, you will be updated shortly.
Check before you travel:
You can check your journey using the National Rail Enquiries real-time Journey Planner.
Compensation:
You may be entitled to compensation if you experience a delay in completing your journey today. Please keep your train ticket and make a note of your journey, as both will be required to support any claim.