The families of three Americans being held in Iran plan to release video footage that they say proves the three were simply on vacation and had no underhand intentions when they strayed across the border.

Shane Bauer, 27, Sarah Shourd, 31, and Josh Fattal, 27, have been detained since July 31. They apparently crossed into Iran by accident while hiking in a scenic area in northern Iraq. They have been visited by Swiss diplomats, who oversee U.S. interests in Iran, but have had no contact with their families.

Iranian Foreign Minister Manouchehr Mottaki said last week that investigators are still questioning the three and that their fate rests with judicial authorities.