The federal government ordered U.S. citizens to shelter in place across five Mexican states Sunday after the Mexican army killed one of the country’s most powerful cartel leaders.

The shelter in place applies to Mexico’s Jalisco, Tamaulipas, Michoacan, Guerrero and Nuevo Leon states, according to the U.S. Embassy and Consulates in Mexico. The Mexican army announced Sunday that it had killed Nemesio Rubén Oseguera Cervantes, known as “El Mencho,” who led the Jalisco New Generation Cartel, which is known for trafficking massive amounts of fentanyl and other drugs into the United States, the Associated Press reported.

The U.S. issued the shelter in place order because of “ongoing security operations and related road blockages and criminal activity,” according to the embassy and consulates. The killing launched hours of roadblocks and burning vehicles across multiple Mexican states — methods that cartels use to interfere with military operations, according to the AP.