The Arizona State Trade and Investment Office has opened in Mexico City. Gov. Jan Brewer's says it's the latest major effort by the state to strengthen and secure economic ties with Arizona's largest trading partner.

Authorities are testing water from the San Pedro River in southern Arizona that may be contaminated with toxic waste that traveled north after a massive copper mine spill in Mexico this summer.

The number of immigrant children caught alone illegally crossing the Mexican border into the United States continued to decline in August, according to figures disclosed Wednesday by the Homeland Security Department.

A Border Patrol official who was removed from his position in June is accusing the agency of covering up "highly suspect" deaths in clashes along the southern border.

Border security and illegal immigration have become dominant issues in the Republican primary for governor as some accuse their opponents of making unrealistic promises that they can’t keep.

House Republicans moved toward a vote Thursday to address the immigration crisis on the border, after GOP leaders agreed to conservative demands for a separate vote aimed at blocking President Barack Obama from expanding deportation relief to millions.

A bill to deal with the immigration surge on the U.S.-Mexico border won a temporary reprieve in the Senate Wednesday as lawmakers maneuvered to offer some response to the crisis before adjourning for the summer.

At an impasse on immigration, House Republicans and Senate Democrats advanced competing proposals Wednesday for dealing with tens of thousands of young migrants showing up at the southern border. Each side quickly ruled the other's approach unacceptable, leaving any solution unclear with Congress' annual August recess looming.

TUCSON ai??i?? Mexico's government is donating more than 1,600 Spanish-language textbooks to the Arizona Department of Corrections.

Moises de la Cruz grows corn on a 7-acre plot of mountainous land 120 miles north of the Mexico-Guatemala border just as his father did and his father before him. He has never heard of the North American Free Trade Agreement but is profoundly aware that his life as a farmer has drastically changed over the past 20 years.