stefanie dekker reports. >> it was a violent friday. a day accustomed to protests, but this one more heated than most. in cairo police fired tear gas on protesters, and the crowd set the streets alight. the threat of arrest didn't stop those unhappy with military rule. protesters defied the military across the country. the declaration by the interim government that the muslim brotherhood is a terrorist organization gives authorities the power to arrest those and convict those they say are part of the group or promoting its interests. >> taking part in a march could land you in prison for five years. >> both sides are deeply entrenched. the muslim brotherhood has angered many people in egypt. there's a large swath of the general public that supports military and security action against them. however, the muslim brotherhood has its core supporters that no matter what they will continue to go out and protest. >> at least 100 protesters have been arrested. the anti-coup alliance will demand the government respect the results of the last dem