From freethehikers.org:
FREE THE HIKERS SHANE BAUER, SARAH SHOURD, JOSH FATTAL
Shane Bauer, Josh Fattal and Sarah Shourd have been detained in Iran since July 31, 2009, when news reports say they accidentally crossed an unmarked border during a hiking trip in the mountains of Iraqi Kurdistan. They were in a peaceful region of Iraq that is increasingly popular with Western tourists.
The three young Americans, all graduates of the University of California at Berkeley, are believed to be held in the Iranian capital, Tehran. They have not been charged with any crime, have had no contact with their families, and have not been granted their right to consular access.
Shane, Josh and Sarah care greatly about the world. They admire and respect different cultures and religions and share a love of travel that has taken them to many countries. That’s why they went to Kurdistan, not because they wanted to enter Iran.