Detectives in central Athens this week freed an Albanian mother of two who was kidnapped, along with her children, from Tirana two months ago by a fellow Albanian and forced into prostitution in Greece, police said yesterday. The 21-year-old woman was abducted at gunpoint from a Tirana street as she tried to save her two- and four-year-old children from a man who had just bundled them into his car. The kidnapper, identified as Albert Deliu, 34, drove all three to Athens and locked them up in a Galatsi flat where, with the aid of his 28-year-old brother, Leonard, he was keeping another young Albanian woman imprisoned. Albert Deliu allegedly raped the mother, videotaping the scenes, and threatened to send the tapes to her husband and family in Albania, or kill her children, unless she worked for him as a prostitute. She eventually did so through newspaper adverts.Police raided the house this week, arrested Deliu and freed his prisoners.