Al Jazeera English, Live Now: Gunfire in Tahrir Square

MSNBC reporters have a hotel with a direct view, and are also giving live commentary. Gunfire and what sounds like artillery are clearly audible.

EDIT: State Department has arranged evacuation flights and is advising Americans to report to the airport immediately.

Armor moving away from positions near the square and toward the Nile bridges according to reporters and activists on the phone (AJE).

One person may have been killed (Reuters / Al-Arabeyya reporting) ... gunfire may be coming from several directions.

Gunfire increasing, 4 or more people killed, others wounded.