Officials are monitoring the situation in Iceland, as a volcano could be set to erupt.
An Icelandic volcano could erupt, causing travel chaos in the airline industry, it is feared.
The Hekla volcano is showing measurements that are worrying officials, as its eruption could create an ash cloud that would potentially disrupt flights, AFP reports.
Geophysicist Pall Einarsson told the news source: "The movements around Hekla have been unusual in the last two to three days."
It does not necessarily mean that the volcano will erupt imminently, but there has been a slow magma build up during recent years that is causing the mountain to gradually expand.
There are also concerns due to the location of the site, which is close to Eyjafjoell, the volcano that erupted in 2010 and provoked travel chaos for millions of passengers.
Ari Trausit Gudmundsson, also a geophysicist, said: "Something is going on," but it is "unclear" if and when Hekla will blow.
The international news agency explains locals dubbed the area the "Gateway to Hell" in the Middle Ages, as it is one of the country's most active spots and most recently spewed lava on February 26th 2000.
Project manager at the Icelandic Civil Protection Authority Rongvaldur Olafsson explains officials are watching the developments closely, particularly given the short timespan since the nation's Grimsvoetn volcano erupted, disrupting travel as far afield as Australia.
Many flights in and out of the country had to be cancelled or rerouted due to the potentially dangerous ash particles in the atmosphere.
Mr Einarsson pointed out that "Helka never gives you much of a warning", which may explain why there is a certain level of concern over the situation.
By Anne Jones
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