jackie gerris, thanks. >>> violent protests in cairo.esters, at least 24 are dead, hundreds injured. the violence is escalating after four days of clashing between security force ands protesters. so let's head to cairo and ivan boston. good morning, ivan. >> reporter: good morning, carol. that's right. thousands of people slept here overnight on blankets that were being brought in to support them. the crowds are swelling throughout the day. meanwhile, in the streets leading away from the square in direction of the interior ministry which is a five-minute's walk away, that's where the battles are raging between riot police and angry young ee jipgszs. there are clouds of tear gas back therement we just came from there and we had the good fortune to be equipped with gas masks. the young people in there don't have them. they are spitting and puking from the effects of this gas running up to us with canisters. one of them i saw today showed that the gas had been manufactured in jamestown, pennsylvania. and we can see another cloud billowing u