Ismael “El Mayo” Zambada, a longtime leader of Mexico’s Sinaloa cartel, and Joaquín Guzmán López, a son of another infamous cartel leader, were arrested by U.S. authorities in Texas on Thursday, the U.S. Justice Department said.

According to a Mexican federal official, Zambada and Guzmán López arrived in the United States on a private plane and turned themselves in to authorities. The official spoke on the condition of anonymity because he was not authorized discuss the matter.

The U.S. government had offered a reward of up to $15 million for information leading to the capture of Zambada, who eluded authorities for decades.