SIPTU's warning that an all out Luas strike could start in 5 weeks time.

Pay talks between union reps and management broke down at the Workplace Relations Commission last night.

Commuters in Dublin have been left without Luas services on four days since Christmas, with more stoppages planned over Easter and St Patrick's Day.

SIPTU's Eoin Reidy says staff will consider their options before taking any further action: