Iran's nightmarish approach to press freedom struck again this week, when four journalists, including three American citizens, were detained in Tehran. Washington Post correspondent Jason Rezaian and his wife, fellow journalist, Yeganeh Salehi, have been held since Tuesday along with two freelance photojournalists. It's unclear why they've been detained. Rezaian, a dual citizen, is one of the rare foreign reporters with official accreditation in Iran.