Here's an editorial note from a Reuters piece we just ran in our news section.

(Editors' note: Reuters coverage is now subject to an Iranian ban on foreign media leaving the office to report, film or take pictures in Tehran.)

We've been noticing today how, despite the fact that a lot seems to be going on in Tehran today, it's much more difficult to get images or accounts of just what's occurring. It seems like the blanket ban on reporters leaving their offices may be having a big effect.