Sarah Shourd: In Washington, White House spokesman Tommy Vietor said the Obama administration is in close contact with the families of the detained hikers and the Swiss Embassy.
First set up by the Shah of Iran in the 1970s, the Alavi Foundation's alleged links to Iran have been under the scrutiny of federal investigators for years.
The US government Thursday moved to seize the assets of the Alavi Foundation – including a New York skyscraper and four mosques. The Justice Department says the Alavi Foundation funnels money to the Iranian government for its nuclear program.
US Treasury secretary Geithner warned of illicit financing from Iranian banks. His statement comes the week after Iran appeared to be cooperating with Western nations to start monitoring its nuclear program.