A man has been arrested over an explosion at Southgate Underground station that left five people injured when passengers fled in mass panic.

The 23-year-old was held by police on suspicion of "doing an act likely to cause an explosion to injure or damage property" on Tuesday night.

British Transport Police said on Wednesday morning that the small blast at the Tube station in north London is believed to have been caused by a faulty drill battery.

Officers were called to reports of people running at the station at shortly after 7pm. One man on a "packed" escalator said some people had been "trampled" in the commotion.

Police said the arrested man, from Enfield, was detained "on suspicion of doing an act likely to cause an explosion to injure or damage property, and endangering safety on the railway."