Protesters drive wedge between Egypt’s Army, police

>>> let's go back to richard engle in cairo . richard , for folks that don't know, you lived and worked in cairo for, what was it, four years when you were starting out as a reporter. you know the city and the country well. you take police and the army in the united states , they're both respected members of society. but there is a vast difference between those two in egypt. explain how that fits into what we're seeing out of there today.

>> reporter: all of the anger today, brian, was directed at the police. in particular the riot police . they are the people -- they are the authorities that egyptians come into contact with on a daily basis and often not in a pleasant way. corruption is a daily problem. petty bribes are something that has long infuriated egyptians. the army, on the other hand, stays out of the city and people have a great respect for the army. they have very little interaction with the army. so to see tonight the army come into the city sends a very clear message that the times have changed and the egyptian people don't want to confront the army. they want to create a divide between the police and the army. so all day we saw people here burning police vehicles and cheering soldiers.

>> and they're letting civilian vehicles through on the streets, hitting the police cars as they go by, and they allowed the army to come in tonight, i understand, and surround the central museum , which is the largest collection of antiquities in that region, just to make sure the treasures of egypt wouldn't get upset in all of this.

>> reporter: there was first a human chain around the egyptian museum . people don't want there to be any looting. there had been some rumors that looting had begun of the precious antiquities. then the army came in, surrounded the main entrances of the museum and people welcomed that.

>> lall right, richard engle in cairo . we'll come back to you before the end of the broadcast. richard , thank you for your reporting.