An enormous swarm of locusts is plaguing Egypt, in a development that agricultural authorities admitted they failed to predict.

Egyptian Agricultural Minister Salah Abad Almoman said the swarm, comprising an estimated 30 million insects, descended on Giza, near southern Cairo, where it is causing great damage.

“The armed forces and the Egyptian border units are trying to battle the swarm with various means at their disposal,” Almoman said, according to a report in Maariv, but the report did not detail what action was taken. The minister appealed to local residents to refrain from attempting to deal with the ravenous horde themselves.

A ministry official said crop-spraying aircraft will be deployed to tackle the insects, which are a seasonal phenomenon in Egypt — albeit not in such large quantities.

Almoman said strong winds predicted for the coming days are expected to blow the insects in the direction of Saudi Arabia and the Red Sea. Although winds usually take the insects past Israel, in 2004 a large swarm descended on Eilat and the surrounding area. It did not spread to the more fertile areas in the center and north of the country.