Enduring America is tracking today's dramatic developments in Iran:

1254 GMT: RAHANA sums up the current situation in Tehran poignantly: "Tehran has once again become a barracks."

1535 GMT: Rah-e-Sabz reports at least 10 people arrested in Mashhad. BBC Persian reports shots fired near Vanak Square in Tehran. Tehran witness says protesters are chanting "Death to Dictator" near Azadi & Enghelab Avenues.

1605 GMT: Mardomak reports that rallies are trying to form in Tabriz and Shiraz, but are being blocked by security forces. A witness is reporting "mass arrests" in Tehran.

1616 GMT: Saham News is reporting --- but now as "unconfirmed" --- that two security vans were set on fire by protestors at Enghelab Square.

1724 GMT: A Journalist, speaking to Kaleme, reported that he was "spattered in blood" after security fired shots into the crowd. Kaleme is calling today's security presence in Tehran, and the resulting violence, "unprecidented." We have not yet verified these reports.

Tehran Bureau has more: