Authorities in El Salvador have started to evacuate the municipality of San Miguel after the Chaparrastique volcano erupted on Sunday, shooting a giant ash cloud into the sky.
The government has issued a yellow alert and is expected to evacuate families within 3 kilometers (approximately 2 miles) of the volcano to emergency shelters.
More than 5,000 people live near the volcano according to civil protection officials.
Civil defence director Jorge Melendez said: "We have implemented emergency measures to evacuate villages located within 3 kilometres of the volcano."
There were no immediate reports of serious injuries, although two people are being treated for respiratory problems.
Health authorities recommend breathing through moist handkerchiefs and avoid drinking water from local sources.
The eruption began at 10:30 am local time on Sunday morning and shot a column of gas and ash 5 kilometres (approximately 3 miles) high into the sky, according to El Salvador's ministry of environment and natural resources.
The government is monitoring the situation and searching for traces of fresh lava.
President Mauricio Funes said in a television address: "We are not certain there will be new eruptions, but we can't rule out that possibility either."
The Chaparrastique volcano, which is about 140 kilometres (86 miles) to the east of the capital, last erupted in 1976.