A bomb alert at Calais-Fréthun station in northern France has halted Eurostar services between London and Paris in both directions, while a separate trespass incident has caused cancellations and delays of up to an hour on Gatwick routes.

French authorities said the alert was being assessed. Services through Calais-Fréthun were suspended, preventing Eurostar trains from passing through.

All lines between Gatwick Airport and Purley were blocked earlier in the morning by a trespasser. They have since reopened, but services remain severely disrupted, with delays of up to 60 minutes and major disruption expected to continue for more than an hour. Passengers on affected routes have been advised to use an alternative route.

The disruption extends beyond airport journeys. Affected services include Gatwick Express between Brighton and London Victoria, and Great Western Railway between Gatwick Airport and Reading.

Southern services affected run between London Victoria and Portsmouth Harbour, Bognor Regis, Littlehampton and Eastbourne, as well as between Gatwick Airport and Redhill. Thameslink routes affected include Brighton and Three Bridges to Bedford, Brighton to Cambridge, and Horsham to Peterborough.

Separate infrastructure faults are also delaying journeys across London. Lines between Marylebone and Wembley Stadium have reopened after a signalling fault, although trains between Marylebone and West Ruislip may still be delayed by up to 45 minutes. Another signalling fault has reduced services between Marylebone and Aylesbury Vale Parkway via Great Missenden.

Between London Bridge and Dartford, lines have reopened following a points failure. Cancellations and delays may continue while services recover, with disruption expected until around 11.15am. Thameslink trains between Luton and Rainham are affected.

On the Underground, a faulty track at South Woodford is causing major Central line delays between Leytonstone and Epping, with minor delays elsewhere on the line. Tickets are being accepted on London Buses.

The Windrush line has severe delays between Highbury & Islington and Dalston Junction following an earlier faulty train at Brockley. A good service is running on the rest of the line.

A points failure at Barking has suspended the Suffragette line between Barking and Barking Riverside, with a good service elsewhere.

For passengers on the reopened Gatwick, Marylebone and Dartford routes, the distinction matters: access to the tracks has been restored, but normal services have not.