Though Mexican police have crossed the border into the U.S., no helicopters have been reported crossing the border. The Mexican government disputes Border Patrol's claims otherwise, saying the chopper in question was just conducting a raid nearby.

On Thursday morning, helicopters from the Mexican attorney general's office and the Secretary of National Defense began hovering above a ranch 100 yards south of the Arizona border. The government was raiding a ranch it suspected was being used to traffic illegal drugs and ferry undocumented immigrants across the border.

Tomas Zeron de Lucio, senior director of the Criminal Investigation Agency of the Mexican attorney general's office, said in a statement that during the raid, criminals inside opened fire on the helicopters. Those were the only shots fired. However, Border Patrol officers said one of the helicopters crossed the border and fired near agents, according to Arizona Central.

"At approximately 5:45 a.m. Thursday morning, a Mexican law enforcement helicopter crossed approximately 100 yards north into Arizona nearly eight miles southwest of the Village of San Miguel on the Tohono O'odham Indian Nation while on a law enforcement operation near the border," a Customs and Border Protection statement said. "Two shots were fired from the helicopter, but no injuries or damage to U.S. property were reported. The incident is currently under investigation."

Zeron de Lucio said that during the raid, they arrested 27 migrants from Mexico and 13 from Central America who were planning on crossing. They estimate roughly 400 migrants were being smuggled through the house every day.

"With the seizure of the La Sierrita ranch, the flow of a large quantity of migrants and drugs crossing from Mexico to the United States has been stopped," Zeron de Lucio said. "These actions by the Mexican government reaffirm our commitment to combating organized crime."

NBC News said Border Patrol agents believed the shots were "warning shots" and said they were fired at officers in an unmarked car. When the Mexican officers realized the mistake, they landed the aircraft and apologized.

However, despite the assertion of Mexico's actions and the recognition of the mistake, Zeron de Lucio did not acknowledge interaction between Mexican officials and American agents. He simply reiterated the success of the raid and the benefit of collaboration between the two countries against drug traffickers and people smugglers.

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