Supporters of a U.S. hiker detained in Iran are fasting on his birthday Saturday, in his hometown outside Philadelphia, Pennsylvania.

Josh Fattal turns 29 Saturday. He and 28 year old Shane Bauer have been held on spy charges in Iran for almost two years.

A third hiker, Bauer's fiancee Sarah Shourd was arrested with them and released last year.

The trio was taken into custody after crossing into Iran from Iraq in July of 2009.

The two men were set to go on trial last month, but they not taken to court, and no explanation was given to their families.

Friend and relatives of Fattal say Saturday's fasting is show of solidarity with the arrested men's mothers who began a hunger strike last month.