A man has been arrested after running onto the tracks at Bow Church station.
The British Transport Police (BTP) and Metropolitan Police were called at 4pm on Thursday following a report of a fight near to Bow Church DLR station.
BTP said, following the fight, someone had run onto the train tracks and a weapon had been witnessed.
The force said a knife was seized and the Metropolitan Police made one arrest
British Transport Police said in a statement: "We were called to Bow Church DLR station in London at 4pm today following an incident involving a weapon.
"Officers from @BTP and @metpoliceuk are at the scene and enquiries are ongoing. One person has been arrested."
Imagery shared to social media shows officers and police dogs searching the rail lines and a police helicopter aiding the search.
Inquiries are ongoing into the fight and how it started.
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