Arab terrorists 'are getting into the US over Mexican border'

President Bush has launched a drive to halt illegal immigration across America's porous southern border, amid growing fears that terrorists may be using Mexico as a base camp before heading to Arizona, Texas and California.

A string of alarming incidents has convinced Bush administration officials that lax immigration rules, designed to cope with the huge numbers of illegal entrants from Mexico, have become a significant loophole in the war on terror.

Over the past month, border agents from Arizona and Texas have anonymously reported recent encounters with dozens of Arab men, who have made their way across the 2,000-mile Mexican border.

Patrol agents told one Arizona newspaper that 77 males "of Middle Eastern descent" were apprehended in June in two separate incidents. All were trekking through the Chiricahua mountains and are believed to have been part of a larger group of illegal immigrants. Many were released pending immigration hearings. According to Solomon Ortiz, the Congressman for Corpus Christi in Texas, similar incidents are "happening all over the place. It's very, very scary".

The two groups of Arab males were discovered by patrol guards from Willcox, Arizona. "These guys didn't speak Spanish," said one field agent, "and they were speaking to each other in Arabic. It's ridiculous that we don't take this more seriously. We're told not to say a thing to the media." A colleague told the paper: "All the men had brand-new clothing and the exact same cut of moustache." Local ranchers have also reported a rise in the sightings of large groups of young males.

Last month, border patrol agents at McAllen airport, Texas, arrested a woman believed to be Pakistani, who was carrying a false South African passport. The woman, Farida Ahmed, is still being questioned by the FBI. She was travelling to New York, and admitted to having illegally crossed the Mexican border. She was still carrying a pair of wet jeans in her travel bag.