The office of Serbian president says former Bosnian Serb leader Radovan Karadzic, a top war crimes suspect, has been arrested in Serbia.

President Boris Tadic's office says in a statement that Karadzic was arrested on Monday evening "in an action by the Serbian security services."

Karadzic has been indicted by the U.N. war crimes tribunal for former Yugoslavia for genocide during the 1992-95 Bosnian war. He has been hiding since 1998.