A man watches as the Chaparrastique volcano shoots a a cloud of gas and ash about three miles (five kilometers) into the air in the city of San Miguel, El Salvador, Sunday Dec. 29, 2013. The spokesman for El Salvador's Red Cross says evacuations have been ordered for inhabitants living within about two miles (three kilometers) of the peak. The volcano last erupted in 1976. (AP Photo/Nely Villatoro-Imagenes Libres)

Authorities in El Salvador evacuated an area around the Chaparrastique volcano after the peak shot a cloud of gas and ash about 3 miles (5 kilometers) into the air on Sunday.

Civil Defense Director Jorge Melendez said a yellow alert had been issued and investigators had been sent to the area to look for signs of fresh lava, but that none has been detected so far.

"We have implemented emergency measures to evacuate villages located within 3 kilometers of the ," Melendez said. Shelters have been set up for the evacuees, but Melendez said some inhabitants had been loath to leave their homes. "One has to leave for one's own safety," he said.

Assistant Health Minister Eduardo Espinoza said two people had been treated at hospitals for apparently linked to the eruption, "but we do not have any serious cases to report."

"We are providing assistance to people evacuating, and we are asking them to protect themselves against the gases, which can affect the ," Espinoza said. He also urged those near the volcano to avoid drinking from local water sources.

The 7,025-foot (2,129-meter) volcano is located about 90 miles (145 kilometers) east of San Salvador, the capital. Its last significant eruption was in 1976.

The Chaparrastique volcano shoots a a cloud of gas and ash about three miles (five kilometers) into the air as seen from the city of San Miguel, El Salvador, Sunday Dec. 30, 2013. The spokesman for El Salvador's Red Cross says evacuations have been ordered for inhabitants living within about two miles (three kilometers) of the peak. The volcano last erupted in 1976. (AP Photo/Nely Villatoro-Imagenes Libres)

San Miguel is one of the country's largest cities and is located 30 miles (50 kilometers) from the volcano.