London's central Tower Hill underground station was evacuated after a phone battery exploded and caused a small fire on Tuesday afternoon.
"Officers have been called to Tower Hill station following a fire alert," BTP tweeted.
"The station is closed whilst officers and LondonFire responds," it added.
Witnesses reported a small fire was erupted after a phone battery overheated and exploded.
Passengers fled the tran as police confirmed the incident was not terror related.
Transport for London (TFL) said some services had been suspended and there were severe delays due to the alert.
