U.S. Secretary of Homeland Security Janet Napolitano said that security on the southern U.S. border "is better now than it ever has been" and that violence from neighboring Mexico hasn't spilled over in a serious way.

Napolitano spoke at the Bridge of The Americas border crossing, after a meeting with the mayors of the border towns of El Paso, Nogales, Ariz., and Yuma, Ariz. Under Secretary of Commerce for International Trade Francisco Sanchez and U.S. Customs and Border Protection Commissioner Alan Bersin also were present.

Napolitano said the Department of Homeland Security will deploy 250 more border agents and expects to have 300 more under their next budget if it's approved. She stated that Homeland Security is investing "millions of dollars in the side of commerce and trade" to improve infrastructure and technology along the border.

However, she added that there is a need to correct wrong impressions about the border region. Napolitano said border towns are safe for travel, trade and commerce. She noted that the total value of imports crossing the Southwest border was up 22 percent in fiscal year 2010, she said.

"There is a perception that the border is worse now than it ever has been. That is wrong. The border is better now than it ever has been," she said.

The perception that the violence in Mexico has spilled over to bordering U.S. cities is "wrong again," Napolitano said. Violent crime rates have remained flat or decreased in border communities in the Southwest, she said. However, she recognized that "there is much to do with (their) colleagues in Mexico in respect to the drug cartels" that are largely responsible for the unprecedented wave of violence in that country.