We understand from local police that nine of our supporters suffered injuries last night following an incident in the city (Rome) centre.
Three of those supporters were taken to hospital for further treatment. We continue to seek further information and are liaising with Italian and UK police on this matter.
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Thousands of passengers now face delays, with Southeastern trains warning "all services" would be affected.
Paramedics attended a scene in Willesden, north-west London, on Monday afternoon where they found the teenager with stab wounds.
At least five people have suffered minor injuries but the cause of the blast is still unknown.