Children evacuees look out from a convention center being used as a shelter several hours before the expected arrival of Hurricane Alex, the first Atlantic hurricane of the year, in Matamoros, northeastern Mexico, on the border with Texas on Wednesday, June 30, 2010. (AP Photo/Eduardo Verdugo)
Evacuees pictured inside a convention center being used as a shelter several hours before the expected arrival of Hurricane Alex, the first Atlantic hurricane of the year, in Matamoros, northeastern Mexico, on the border with Texas on Wednesday, June 30, 2010. (AP Photo/Eduardo Verdugo)
This satellite image provided by NOAA shows Hurricane Alex as it comes ashore Wednesday on a relatively unpopulated stretch of coast in Mexico's northern Tamaulipas state, about 110 miles south of Brownsville, Texas. Alex is moving west near 10 mph. Maximum sustained winds are near 100 mph with higher gusts. Steady weakening is expected as the hurricane moves over land according to forecasters. (Associated Press/NOAA)
This image provided by NOAA was acquired Tuesday June 29, 2010, at 5:32 p.m. EDT shows Hurricane Alex churning through the western Gulf, taking aim at the Mexico-Texas border and far away from the massive oil spill. (AP Photo/NOAA)
ASSOCIATED PRESS Argentina's Carlos Tevez, center, is lifted by teammates at the bench to celebrate his scoring the third goal during the World Cup round of 16 soccer match between Argentina and Mexico at Soccer City in Johannesburg, South Africa, Sunday, June 27, 2010.
**FILE** In this June 7, 2010 photo, people stand on the Paso Del Norte border bridge to watch the police activity below after 15-year-old Sergio Adrian Hernandez Huereca was killed below the bridge in the city of Ciudad Juarez, Mexico. Federal records show that Hernandez was among El Paso's most wanted juvenile smugglers. (Associated Press)
A U.S. Border Patrol agent patrols the U.S.-Mexico border fence in Tijuana, Mexico. The Border Patrol has quietly reduced its current force of available agents along the border because of cuts in the amount of overtime hours the agents can work. (Associated Press)
ASSOCIATED PRESS Uruguay players celebrate at the end of the World Cup group A soccer match between Mexico and Uruguay at Royal Bafokeng Stadium in Rustenburg, South Africa, on Tuesday, June 22, 2010. Uruguay won 1-0.
ASSOCIATED PRESS Mexico's Javier Hernandez celebrates after scoring during the World Cup group A soccer match between France and Mexico at Peter Mokaba Stadium in Polokwane, South Africa, Thursday, June 17, 2010.
Arizona Attorney General Terry Goddard holds a news conference in Phoenix to announce that he has been informed the Obama administration will send 1,200 National Guard troops to the U.S.-Mexico border. (Associated Press)
A group of illegal immigrants walk with bottles of water shortly before nightfall as they cross the desert between Sasabe, Mexico, and Sasabe, Ariz., in April 2006. (Associated Press)
A sign marks Mexico's border with the United States as lanes are closed at the San Ysidro port of entry in Tijuana, Mexico, on Saturday, April 17, 2010. (Associated Press)
A prototype of a tower for a virtual fence along the U.S.-Mexico border stands at a test facility in Playas, N.M. (Associated Press)
Trucks coming from Mexico prepare to enter the highway after crossing the border March 24, 2009 in Otay Mesa, California. (Photo by Sandy Huffaker/Getty Images) ** FILE **
A great white shark cruises underwater in search of prey off Guadalupe, Mexico. A new study shows that great whites stalk specific victims and learn from their experiences. (Associated Press) ** FILE **
This Normandy-style barrier fence along the U.S.-Mexico border near Columbus, N.M., features extra low and high bars to prevent livestock from crossing and possibly spreading disease. (Associated Press)
A Mexican soldier stands guard near a U.S.-Mexico border crossing during an operation in Ciudad Juarez, Mexico, in early March. A federal report, released following a Freedom of Information Act lawsuit, says unauthorized border crossings by Mexican soldiers and police more than tripled in 2008. (Associated Press)
Homeland Security Secretary Janet Napolitano says the U.S. is creating contingency plans to respond to a border threat should Mexico fail in its war against drug cartels. (Associated Press)
A Mexican marine patrols near the U.S.-Mexico border wall in Tijuana, Mexico, on March 18, 2009. The administration of President Obama is preparing to send federal agents to the U.S.-Mexico border as reinforcements in the fight against Mexican drug cartels. The Obama administration is preparing to send federal agents to the US-Mexico border as reinforcements in the fight against Mexican drug cartels. (Associated Press)
The Rio Grande forms an elbow known as the Big Bend as it flows southward from El Paso, Texas, defining the U.S.-Mexico border. As seen at Big Bend State Park, mountains form a natural barrier. Residents on both sides say they are glad not to be separated a border fence. Rusty Hill (left) owns a store in La Ruidosa, Texas. (Associated Press)