A man was stopped at Upton Park tube station for not wearing a face mask, as police continue to target commuters in Newham.
Officers from British Transport Police (BTP) have stepped up patrols at the station, as well as increasing their presence at nearby East Ham and West Ham stations.
Since January 9, BTP have made 13 arrests as part of Operation Steed, including a man who was spotted not wearing a face mask.
His arrest, on January 18, came after he was searched and officers found 10 bags of what was suspected to be cannabis.
The operation has included high visibility and plain clothed patrols, as well as knife arches.
PS Sadiq Ali, who leads one of BTP's neighbourhood policing teams, said: “The operations limit disruption, tackle anti-social behaviour towards rail staff, catch wanted criminals and keep journeys safe and peaceful."
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