Metrolink
More than 200 workers are to strike for four days next month on Greater Manchester's Metrolink tram service.
The walkout by Unite members over pay increases looks set to cause chaos over the weekend of the city's sell-out Parklife music festival.
The workers, who include network controllers, staff that check tickets and engineering and business support, will strike from 21:00 BST on 7 June to 05:59 on 10 June.
Metrolink has been asked to comment.
Around 80,000 people are expected over the three-day festival in the city's Heaton Park, with many of them expected to travel by tram.
Unite claims Keolis Amey Metrolink Ltd, which runs the service on behalf of Transport for Greater Manchester, has offered pay rises of between 1% and 5% depending on which group a worker belongs to.