It sounds like the plot of a farfetched science fiction movie. Unfortunately for the residents of Texas, it is very much a reality: billions of tiny reddish-brown ants have arrived onshore from a cargo ship and are hell-bent on eating anything electronic.

Computers, burglar alarm systems, gas and electricity meters, iPods, telephone exchanges – all are considered food by the flea-sized ants, for reasons that have left scientists baffled.

Having ruined pumps at a sewage facility, the ants are now marching towards Nasa’s Johnson Space Centre and William P. Hobby airport, Houston, putting state officials in a panic. “They’re itty-bitty things, and they’re just running everywhere,” said Patsy Morphew, a resident of Pearland, on the Gulf Coast.

She spends hours sweeping them off her patio and scooping them out of her pool by the cupful. “There’s just thousands and thousands of them. If you’ve seen a car racing, that’s how they are. They’re going fast, fast, fast. They’re crazy.”