Latvia-based LCC Primera Air announced this morning that it's ceasing operations immediately.
The same message is now posted at primeraair.com and includes the helpful advice that:
"...the usual options for contacts (via email or phone) can not be offered any longer."
Those close to the situation attribute Primera's failure to an unsuccessful long-haul expansion.
The airline operated primarily between Scandinavian cities and destinations in southern Europe, the Middle East and North America.
According to the UK CAA, the airline was not covered by ATOL protection, and accordingly CAA is not obliged to mount a rescue operation for stranded passengers.