Tube drivers will stage four strikes in two weeks over the sacking of a colleague, a union has announced.

The Rail Maritime and Transport union (RMT) said its members would walk out on June 19, 27 and 29 and July 1.

It said the strikes were over a failure to agree to reinstate driver Arwyn Thomas, who is awaiting the results of an employment tribunal.

Mr Thomas, who is claiming unfair dismissal, was sacked on disciplinary charges.