The Washington Post reports:
CAIRO - The Egyptian army called Wednesday for an end to the massive demonstrations that have shaken President Hosni Mubarak's grip on power, and the mood turned ominous as the anti-government crowds were confronted by angry Mubarak supporters.
The peaceful, carnival-like atmosphere that prevailed during Tuesday's massive demonstrations gave way to a tense, charged standoff between pro-democracy demonstrators and thousands of Mubarak supporters, many of whom who had been bused in.
The two sides threw rocks and chunks of cement at each other, with several people reported injured and some bleeding profusely. Just before 3 p.m. (8 a.m. in Washington), dozens of pro-Mubarak riders on horseback and camelback charged into the square and began to beat anti-government demonstrators with whips and clubs.