PHILADELPHIA (AP) — A federal judge in Philadelphia has ruled that a Russian-American entrepreneur must remain behind bars while he awaits trial on charges of leading a child-sex ring.

U.S. District Judge Mary McLaughlin on Thursday said a magistrate judge was wrong to grant bail to 38-year-old Andrew Mogilyansky, of Richboro. McLaughlin calls Mogilyansky a flight risk and says he has enough money to take his family with him.

Mogilyansky holds dual Russian and U.S. citizenship. He is accused of luring young teenage girls at a Russian orphanage into prostitution and sharing in the profits.

The magistrate judge had ruled Wednesday that Mogilyansky could be released on bail pending trial. Prosecutors appealed that decision.