The police in Hvolsvöllur has issued an alert advicing hikers and travellers to stay off Hekla volcano because of unusual seismic activity. That does not have to mean a volcanic eruption, but it increases the changes of it.
Volcanic eruptions in Hekla volcano are common and usually "tourist friendly" meaning they do not pose any danger to flights, travellers nor homes near the mountain.
Here is the alert from the police:
The National Commissioner of the Icelandic Police (NCIP) and the Police commissioner at Hvolfsvöllur declare an uncertainty phace (lowest level of warning), because of seismic activity in mount Hekla.
The Icelandic Met Office has informed the Civil Protection and Emergency Management of NCIP about unusual seismic activity in mount Hekla. The Icelandic Met Office has raised the ICAO aviation color code to yellow concerning air traffic, which means that mount Hekla is showing an unusual activity.
Uncertainty phace means that supervision has been raised on that course of events that may threaten public health and safety, or that environment or inhabited area may be threatened. To declare an uncertainty phace is a part of work process in the setup of public safety to secure a formal communication between response teams and to secure dissemination of information.
In light of all of this the National Commissioner of the Icelandic Police and the Police commissioner at Hvolfsvöllur would warn people from hiking on mount Hekla while this uncertainty phace is in force.