(visit the link for the full news article)
Chile has raised the alert level for the Copahue volcano to red, the highest possible.
The 3,000m (10,000ft) volcano is in Argentina's south-western Neuquen province, near the Chilean border. It began spewing ash and gas on Saturday morning.
In Argentina, the authorities have told residents of local villages to monitor the situation.
Many people have already left the area as a precaution.
Ash has been raining down on both sides of the border.
Originally posted by alfa1
Red alert issued for volcano on Chile-Argentina border