Lava just started spewing up through a lava area called Holuhraun just north of Bardarbunga volcano in northern Vatnajokull glacier.
An eruption has started north of Dyngjujökull - mbl.is
SIGMET published as well:
BIRD SIGMET 02 VALID 290120/290430 BIRK- BIRD REYKJAVIK CTA VA ERUPTION MT IN PROGRESS BARDARBUNGA / HOLUHRAUN - NO VA OBS - PSN EST PSN N6450 W01640 VA CLD OBS N6444 W01655 - N6510 W02000 - N6600 W01740 - N6444 W01610 SFC/FL180 MOV NNW 20KT