Mexico could borrow from U.S. tactics in the fight against terrorism as it battles a crisis of drug-related violence along the U.S.-Mexico border, the top U.S. military officer said Friday.

Returning from a six-day trip to Latin America punctuated by news of beheadings and intimidation by Mexican drug cartels, the chairman of the Joint Chiefs of Staff said the United States could help with equipment and intelligence techniques.

Adm. Mike Mullen would not be specific about what kind of intelligence or surveillance help the United States might offer, but said he saw ways to employ experience the United States has gained in the ongoing hunt for extremists and terrorists.

He would not say whether there may already be U.S. drones flying over bloodstained cities such as Ciudad Juarez, where 17 bodies came into the morgue on one day recently, including the city police force's second-in-command and three other officers.

"Obviously it affects us because of the relationship between the two countries," Mullen said during a telephone news conference as he flew to Washington following meetings in Mexico, his last stop.

Mullen referred to the spike in violence as a crisis, and said it occupied much of his discussions with Mexican military leaders.

More than 1,000 people have been killed in Mexico in drug-related violence this year. In 2008, the toll doubled from the previous year to 6,290. Both the U.S. and Canada have warned that murders related to drug activity in certain parts of Mexico, particularly along the border with the U.S., raised the level of risk in visiting the country.

There are signs the violent competition among Mexican drug and smuggling cartels is spilling across the border, as cities in Arizona report increases in such crimes as home invasions. More than 700 people were arrested as part of a wide-ranging crackdown on Mexican drug cartels operating inside the United States, the Justice Department said last month.

Last weekend, Defense Secretary Robert Gates said he also saw opportunities for the U.S. military to help with military training, resources and intelligence.

"I think we are beginning to be in a position to help the Mexicans more than we have in the past. Some of the old biases against cooperation with our -- between our militaries and so on, I think, are being set aside," Gates said in an interview that aired last Sunday on NBC's "Meet the Press."

"It clearly is a serious problem," he said.