For years, Mexican drug cartels relied on firearms and brute force to control territory and eliminate rivals. That landscape is shifting. A growing arsenal of improvised explosive devices, car bombs, and drones rigged with explosives now marks a new chapter in the country's brutal drug war. The trend is raising alarms both in Mexico and across the border, where U.S. President Donald Trump has repeatedly threatened military action against the cartels. The latest episode unfolded on a Sunday night in Ojocaliente, a small town in Zacatecas, roughly 360 miles northwest of Mexico City. A bomb packed with 200 kilograms of explosives—about 440 pounds—detonated outside a police station. No one was killed, but the blast injured 11 people and shattered windows and walls of more than 60 homes in the city center. Mexico's security chief Omar García Harfuch confirmed the details during a visit to the state alongside President Claudia Sheinbaum on Friday. Ojocaliente sits in the heart of Zacatecas, a state that has become a battleground between the Jalisco New Generation Cartel (CJNG) and the Sinaloa Cartel. State Attorney General Cristian Paul Camacho reported that Zacatecas has recorded 23 attacks involving explosives this year alone, six of which involved cars or motorcycles rigged with bombs. The violence is not entirely new. Victor Manuel Sánchez, a University of Coahuila professor who has tracked car bombings in Mexico for decades, traces the origins back to 1994, when the Tijuana Cartel targeted Sinaloa Cartel co-founder Ismael "El Mayo" Zambada in Guadalajara. More recently, the CJNG has become the most prolific user of explosives, according to Sánchez. The group is believed to be behind two recent bombings in small city centers: one in Michoacán in December that killed five people, and the Ojocaliente attack. The CJNG is among the organizations designated as foreign terrorist organizations by the Trump administration. The broader use of explosives began about five years ago, when cartels started dropping bombs from drones to strike security forces or rival gangs. They also began burying explosive devices in the ground to control territory. In 2023, roadway bombs planted in western Jalisco killed six people and injured 14. A month later, the Mexican military released its first figures on the threat, reporting that it had seized roughly 2,800 explosive devices nationwide over the previous four and a half years. In 2024, authorities deactivated nearly 3,200 devices in Michoacán alone. This year, an explosive device in Michoacán killed eight soldiers, marking one of the deadliest such incidents in Mexico. Nationwide figures for 2025 have not been released. "It is all a bad development in Mexico," said Vanda Felbab-Brown, an organized crime expert at the Brookings Institution. "We are facing steady intensification of violence. This certainly greatly intensifies the atmosphere of fear and retaliation." President Sheinbaum, however, countered that nationwide killings have declined, calling it evidence that her government's strategy is working. Experts see the car bombs and drones as tools of intimidation. Carlos Pérez Ricart, an international studies professor at Mexico's CIDE university, explained that these attacks draw attention and can be used to pressure authorities into negotiations, especially when criminal groups feel threatened. "The answer to terrorism is the disappearance of the enemy," Pérez Ricart said, noting that in the drug trade, the adversary is not just an armed group but an entire illegal market. Mexico has long avoided labeling cartel violence as terrorism, partly out of fear that such a designation could invite foreign intervention and hurt tourism and investment. Another argument is that terrorism typically involves political or ideological motives, while cartels are driven by profit. Yet civilians have been deliberately targeted before. In 2008, grenades thrown into Independence Day crowds in Morelia killed eight people and wounded dozens. In 2011, gunmen set fire to a casino in northern Mexico, killing 52. The Trump administration's designation of eight Mexican cartels as foreign terrorist organizations—and its use of that framework to justify military action—has made the terminology more consequential. Legal challenges are mounting both in the United States and abroad. As the cartels continue to innovate, the line between organized crime and terrorism blurs, and the stakes for both Mexico and the United States grow ever higher.