Published: Aug. 12, 2012 at 8:13 AM

MADRID, Aug. 12 (UPI) -- Nearly 5,000 people in Spain's Canary Islands have been evacuated as wildfires race through tinder-dry forests and fields, regional officials said.

The worst affected islands are Tenerife and La Gomera, Britain's Sky News television network reported.

More than 7,400 acres of land, including part of a World Heritage nature reserve, on La Gomera have been scorched since Friday, officials said.

"There is no positive change for the moment," an emergency official told reporters.

Firefighters on the ground were being helped by water-dropping aircraft, the report said.

The islands, located off the coast of Morocco, have experienced the driest conditions in some 70 years, the broadcaster said.

Adding to the woes, a heat wave from Africa last week created perfect conditions for the fires with temperatures above 100 degrees, low humidity and breezes.

The environmental secretary for the island of La Gomera, Ventura del Carmen Rodriguez, told reporters it would take at least 30 years for the nature reserve to recover from the fires.

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Wildfires ravaging the Canary Islands