British Transport Police have stated a faulty drill to be the cause of the evacuation of a London Overground train during rush hour.
Officers were called to Dalston Kingsland station around 7am this morning (Wednesday) after receiving reports of smoke on a train.
Video posted on social media showed commuters standing alongside the tracks and the platform, and one tweet said there had been "sheer terror" during the incident.
Several commuters were treated for minor injuries after emergency services arrived.
A British Transport Police spokesperson said: "We were called at 7.10am today to Dalston Kingsland to reports of smoke on a train.
"Fire service also attended and established that a workman's drill had overheated and was smoking.
"This incident is not being treated as suspicious at this time."
Duncan Cross, deputy director of London Overground, said: "Today, there was an incident involving a faulty drill being carried to work by a customer at Dalston Kingsland.
"The train was evacuated as the emergency services attended the incident.
"We would like to apologise to customers whose journeys have been disrupted."