Two earthquakes have been detected close to the Bardarbunga volcano in Iceland, according to the national meteorological service.
The first earthquake had a magnitude of 5.3 and occurred just after midnight local time (1am UK time), while a second weaker earthquake happened around 5:30 this morning.
Although there have been several small quakes, these are the largest measured since the beginning of the current phase of volcanic activity.
There are no signs of an imminent eruption although the possibility can not be ruled out, the Icelandic Met Office said.
More top news
The chart-topping NHS Choir who beat Justin Bieber to number one have signed a Hollywood film deal to tell their success story.
Janet Jackson is expecting her first child at the age of 49, according to reports.
The Rolling Stones have become the latest musicians to ask Donald Trump to stop playing their songs during his campaign.