A new U.S.-military-led task force specializing in intelligence collection on drug cartels played a role in the Mexican raid on Sunday that killed the Mexican drug lord known as El Mencho, a U.S. defense official told Reuters.

The Joint Interagency Task Force-Counter Cartel, which involves multiple U.S. government agencies, was formally launched last month with the goal of mapping out networks of drug cartel members on both sides of the U.S.-Mexico border, American officials said.

The U.S. official, who spoke to Reuters on condition of anonymity, did not offer further details about the task force. The official stressed the raid itself was a Mexican military operation.

A former U.S. official, speaking on condition of anonymity without referring specifically to the task force, said the U.S. compiled a detailed target package for El Mencho and provided it to the Mexican government for its operation.

This dossier included information provided by U.S. law enforcement and intelligence, the former official said.

The former official added El Mencho was very high, if not at the top, of a list of U.S. targets in Mexico.

Mexican authorities killed the man, whose real name is Nemesio Oseguera, during an operation designed to capture him in the western state of Jalisco. The operation set off a wave of violence, with torched cars and gunmen blocking highways in more than half a dozen states.

Mexico's Defense Ministry said U.S. authorities had provided "complementary information," but offered no details. A Mexican government source familiar with the operation said the Mexican government designed and executed it and that no U.S. military personnel were physically involved.

An ex-police officer, Oseguera, 60, was the shadowy leader of the powerful Jalisco New Generation Cartel, an international criminal enterprise widely viewed as one of Mexico's most powerful. He managed to evade arrest for years despite a $15 million bounty from the U.S. for information leading to his arrest or capture.

The kingpin's killing notches a major victory for Mexico's war on drug cartels that are responsible for smuggling billions of dollars in cocaine and fentanyl into the U.S.

President Donald Trump's administration has waged a pressure campaign on Mexican President Claudia Sheinbaum's government to ramp up its crackdown on drug trafficking, including U.S. threats to intervene directly in Mexico.

There is little information publicly available about the JITF-CC. Its website says its goal is to "identify, disrupt, and dismantle cartel operations posing a threat to the United States along the U.S.-Mexico border."

U.S. Air Force Brig. Gen. Maurizio Calabrese, who leads the task force, spoke to Reuters this month about how the U.S. military is channeling its experience battling groups like al-Qaida and the Islamic State to map out cartel networks.

"The cartels operate differently than al-Qaida or ISIS, different motivations, which makes it even more important for us to identify entire networks so that we can disrupt and dismantle (them)," Calabrese told Reuters.

Calabrese noted that estimates vary widely but said there were possibly a few hundred core cartel members "at the top."

"But then you have anywhere from 200,000 to 250,000 independent contractors that will help you move these drugs," Calabrese said.

Jack Riley, a former senior official at the Drug Enforcement Administration, said Trump's designation of Mexican cartels as terrorist organizations last year unlocked new kinds of U.S. military assistance.

He said that could be helpful when it comes to U.S. military intelligence, surveillance, and reconnaissance resources.

"Our surveillance capabilities are going to be probably unlimited, and that will really help with real-time stuff," Riley told Reuters.

"But these guys are extremely astute at being able to cover their tracks, cover who's in charge and where those people are."

A second U.S. defense official, speaking to Reuters ahead of the Mexican operation, said the new task force fit into a broader U.S. strategy to combat drug trafficking that has seen the U.S. military take increasing operational control of the border with Mexico.

It also includes now-regular U.S. strikes on suspected drug boats in Caribbean and Pacific waters, the legality of which has been challenged by Democratic lawmakers.

"The whole idea of creating an interagency effort is to not have stray voltage, is to bring it all together, synchronize it," the second official said of the task force.