Activity at the Copahue volcano, which began erupting over the weekend on the Chile-Argentina border, diminished markedly and the red alert issued for the area was lifted, emergency management officials said.

The National Geophysics and Mining Service ordered the alert level lowered on Christmas Eve.

Residents, however, should be on alert within a five-kilometer (3.1-mile) radius around the crater and on the banks of the rivers that flow out of the volcano, the emergency management office said.

The national emergency management office issued a red alert on Sunday for Alto Biobio, the city closest to the volcano and some 570 kilometers (350 miles) south-southeast of Santiago.

Officials prepared a plan to evacuate 1,797 people in four communities if eruptions increased at Copahue, a volcano 2,997 meters (9,826 feet) high. EFE