The U.S. State Department said on Thursday it is offering up to $10 million for information leading to the arrest or conviction of two brothers identified as leaders of Mexico’s Sinaloa cartel in Baja California state, home to the city of Tijuana.

The reward includes $5 million for information on Rene Arzate Garcia, 42, known as “La Rana,” and another $5 million for his brother Alfonso Arzate Garcia, 52, known as “Aquiles.” Authorities said their current whereabouts are unknown.

The announcement came the same day U.S. authorities unveiled a superseding indictment against Rene Arzate Garcia, who had previously been charged with drug offenses in San Diego.

The updated indictment includes charges of conspiracy, narco-terrorism and providing material support to a designated foreign terrorist organization.