[Blitzer:] Thousands of people hit the streets of Cairo today both for and against the government. It's facing huge tests this week. Voters are deciding whether to approve a new constitution. That happens on Saturday. Reza Sayah is joining us on the phone now from the Egyptian capitol. Huge crowds out there, what is going on, Reza?
[Reza Sayah, Cnn International Correspondent:] Right now there are still some people outside the presidential palace, but the crowds are starting to thin out, Wolf. I think a lot of people are relieved that there were no clashes, no violence tonight because there was a potential for an ugly night. That's because both of these sides of this conflict once again calls for mass demonstration. The opposition faction and opponent of President Morsy called for marches that culminated outside the presidential palace. In about 15 minutes away from that location, there's the Muslim Brotherhood, supporters of the president who gathered in mass. The big question was, would these two sides clash like they did last week? It was an ugly scene last week outside the palace. These two sides brawled it out, nearly 700 injured and several people killed. Thankfully tonight there was no violence. The opposition came out because they still reject the process by which the constitution was done. They don't want the vote on Saturday. The president's supporters saying the best way to solve this conflict is to go out for the vote on the constitution on Saturday Wolf.
[Blitzer:] So that referendum will definitely take place on Saturday despite all of the protesters who wanted to be delayed or never wanted it to happen at all.
[Sayah:] All indications are that this referendum is going to go on its plan and I think the opposition is looking to tomorrow. That's when the opposition leaders are scheduled to announce their decision whether they are going to take part in the referendum or not. If they come out and say yes, we'll take part, there's certainly the potential to diffuse this conflict. If they say no, if they continue to reject this process, certainly the conflict can go on.
[Blitzer:] Reza Sayah on the scene for us in Cairo, thanks very much. Earlier this afternoon here in the United States, the U.S. Air Force launched a secretive new drone into space, we know what the X-37B looks like, but it's a mission that is shrouded in mystery. CNN's John Zarrella is joining us now from Miami with more. What do we know, John?
[John Zarrella, Cnn Correspondent:] Well, Wolf, it did launch this afternoon about 1:00 p.m. Eastern Time on top of an Atlas 5 rocket inside the faring there, the top third of that rocket is where the X- 37B was encased. It looks very much like a mini-space shuttle, about a quarter of the size of a space shuttle. In fact, it was originally designed by NASA and was going to be flown inside of a space shuttle's cargo's base until it was taken over by the Defense department and then the Air force. Every time one of these things flies, two m them have flown before, one in 2010 and one in 2011, there is a huge amount of speculation that comes up. People believe that one of the things they say is this thing could be an anti-satellite weapon, a weapon in space that could shoot down satellites. Others think it could be an on-demand satellite itself. In other words, the military needs to move a satellite into a specific area of the globe to get a quick look somewhere, this could do it. The Air Force says none of that is true, that this vehicle is just an airborne platform. It flies about 200 miles up, orbits the earth, the same way that space shuttles did, but they are testing new technology, everything from command and control to avionics, the heat shielding, things that the Air Force says will be used in military applications but down the road. The problem is, Wolf, a lot of those folks out there that are the conspiracy theorists are not buying it. They think that the X-37 is a lot more than that. In fact, the last one that flew, flew for 469 days, 15 months in space before it landed autonomously back at the Air Force base out in California Wolf.
[Blitzer:] We have no idea how long this one is going to stay up there?
[Zarrella:] None at all, Wolf. No idea if it's going to be a longer or shorter mission or what exactly. But you know, Wolf, there are a lot of countries around the world whose intelligence agencies sure would like to know about it as well.
[Blitzer:] So let the speculation continue, John Zarrella.
[Zarrella:] Exactly.
[Blitzer:] Thanks very much. At the top of the hour, by the way, we're getting new information on a missing American citizen in North Korea right now. But first, a lighter look at the day's news headlines.
[Unidentified Male:] Al Qaeda's number two man has been killed by an American drone in Pakistan, al Qaeda's number three men announced he's stepping down to spend more time with his family.