The White House on Friday renewed its plea for the Iranian government to release three detained American hikers whose families say they're in poor health.

"We were deeply alarmed to learn from the families today of their physical and emotional state of health. We fear their well-being will suffer even more unless their case is resolved without delay," Press Secretary Robert Gibbs said in statement.

Shane Bauer, Josh Fattal, and Sarah Shourd were captured last July and have been held without charges or access to legal representation.

"There is absolutely no justification for their detention, and they should be released without further delay," Gibbs said.