Volunteers packed into a room during a petition-drive training session in Cairo. Mohamed ElBaradei's National Association for Change movement has gathered 900,000 signatures on a petition to amend the constitution and end the stranglehold President Hosni Mubarak's ruling party has over elections. Holly Pickett for NPR hide caption

itoggle caption Holly Pickett for NPR

A municipal worker cleans a sidewalk Tuesday at the site of recent clashes between protesters and security forces near the Interior Ministry in Cairo Muhammed Muheisen/AP Photo hide caption

itoggle caption Muhammed Muheisen/AP Photo