Bus drivers in Dundee have gone on an “unlawful” wildcat strike after two high-ranking union members were suspended over an industrial dispute.

The drivers for National Express Dundee went on strike at the company's East Dock Street depot at 10am on Thursday.

This came after a meeting between Unite union officials and company management over changes to working conditions for drivers in Dundee.

It is understood that no agreement on the conditions was reached, which led to the union officials ordering their drivers to come off the road and go on strike.

However, the chairman and secretary of the Unite branch were suspended and less than an hour later the drivers returned to their work.

After a further union meeting on Thursday afternoon, the drivers opted to go out on strike again and all the buses returned to the depot, meaning no National Express Dundee buses were operating.

It is understood the action will not be lifted again on Thursday, with it likely that National Express Dundee bus services will not run in the city for the remainder of the day.

A number of the drivers remained at the depot while the strike action was taking place.

A National Express spokesman said it was in discussions with trade union representatives to bring an end to the action.

He added: “This afternoon due to unlawful and unsanctioned action by individual drivers a significant number of our services have been affected.

“We are trying to work with the trade unions to resolve this matter which is linked to an ongoing investigation.”