Armed policemen walk on the street near Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Kevin Coombs
British police on Friday advised people to avoid the area near Parsons Green, a west London underground station, after media reports of a blast on a train.
"Officers from the Metropolitan Police Service and British Transport Police are in attendance along with the London Fire Brigade and London Ambulance Service," London's police said in a statement.
"We would advise people to avoid the area."