One cartel leader says he’s trying to figure out how to protect his family in case the American military strikes inside Mexico. Another says he’s already gone into hiding, rarely leaving his home. Two young men who produce fentanyl for the cartel say they have shut down all their drug labs.

A barrage of arrests, drug seizures and lab busts by the Mexican authorities in recent months has struck the behemoth Sinaloa Cartel, according to Mexican officials and interviews with six cartel operatives, forcing at least some of its leaders to scale back on fentanyl production in Sinaloa state, their stronghold.

The cartels have sown terror across Mexico and caused untold damage in the United States. But here in Culiacán, the state capital, the dynamic seems to be shifting, at least for now. Cartel operatives say they’ve had to move labs to other areas of the country or temporarily shut down production.

“You can’t be calm, you can’t even sleep, because you don’t know when they’ll catch you,” said one high-ranking member of the Sinaloa Cartel who, like other cartel operatives, spoke on condition of anonymity for fear of capture.

“The most important thing now is to survive,” he added, his hands trembling.

The government crackdown on organized crime intensified after the Trump administration threatened retribution unless Mexico halted the supply of fentanyl into the United States, vowing high tariffs if the flow of migrants and drugs continued.