A Brooklyn man has been arrested in connection with two kids who disappeared after escaping from an extremist “cult” in Guatemala, authorities said.

Aron Rosner — the brother of a top official in the Jewish sect Lev Tahor — was arrested by the FBI and State Police at about 1 a.m. in Williamsburg on Sunday, according to sources and police officials.

Rosner was charged with kidnapping and obstruction of justice following the Dec. 8 disappearance of 14-year-old Yante and 12-year-old Chaim.

The kids returned to New York after leaving the controversial, nomadic Lev Tahor community, which consists of roughly 35 families living in a compound in Guatemala. They were last seen with their mother in upstate New York.

“He’s the ambassador of Lev Tahor to the US,” a source said of Rosner, who was expected to be arraigned as early as Monday.