The White House says Iran has confirmed it has three American hikers in custody.
The Americans strayed into Iran while hiking in the mountains of Kurdish territory in neighboring Iraq.
President Barack Obama's national security adviser, James Jones, said that as of Sunday morning, the Iranian government had confirmed it had them in custody.
US and Kurdish officials say the Americans accidentally entered Iran across the poorly marked border on July 31.
Reports from Iran have said Teheran was looking into whether the three were spying for the United States.
But until Jones' comment, there had not been any official Iranian government confirmation that the three were in custody.
Jones spoke on NBC's "Meet the Press."