Commenting on the collapse of a deal to save the Murco oil refinery in Milford Haven, William Graham AM, Shadow Minister for Business, said:
"My thoughts are with workers at Murco and their families as well as all those businesses who are involved in the oil refinery supply chain.
"This terrible news is a body blow for the West Wales economy and will leave thousands of highly skilled workers facing uncertainty as we approach Christmas.
"I'm sure that both the UK and Welsh Governments will wish to provide as much support as possible to the local community to support families who have lost their source of income."
Paul Davies, Assembly Member for Preseli Pembrokeshire, said, "I am very upset to hear that this deal has fallen through, with devastating implications for so many Pembrokeshire families.
"This dire news will leave many Pembrokeshire businesses which were involved in the supply chain with significantly reduced orders and could result in many further job losses.
"I will be doing everything I can to ensure that Pembrokeshire workers affected by this oil refinery closure will receive every possible support to enable them to find new employment."