London Underground workers at London Bridge station are staging a 24-hour strike in a bitter dispute over the sacking of a colleague.

Members of the Rail, Maritime and Transport (RMT) union based at the station, one of the busiest on the network, walked out for 24 hours from 10pm on Sunday.

The union is protesting at the sacking of a member of the station staff and disciplining of two others over an incident involving a fare dodger.

The RMT maintains the staff should have been praised for tackling a violent passenger. London Underground disputes the union's version of the incident.

The union is preparing to ballot all its station staff members on LU in an escalation of the row.