This video says about itself:
Cairo clashes video: Egypt riot cops fire tear gas, rubber bullets.
From daily The Morning Star in Britain:
Protesters bombarded by US-made gas canisters
Thursday 30 June 2011
Two days of street battles in Cairo between protesters, police and the armed forces have left over 1,000 people injured.
Clashes began on Tuesday when police violently stopped around 100 people from attending a memorial service for those killed in the uprising which overthrew US-backed despot Hosni Mubarak.
Thousands more joined the protest in response to the police’s tactics.
“When I saw that, I didn’t care. I joined the protesters,” 27-year-old Ihab el-Manharawi told reporters. “People have changed, but they haven’t.”
The crowd then marched on the state television building and the Interior Ministry, chanting: “The people want to oust the field marshal” – a reference to Mohammed Hussein Tantawi, the chairman of the Supreme Council of the Armed Forces which now rules the country.
By late afternoon the army had taken over from riot police, attacking protesters with tear gas and bullets, according to Amnesty International.
Gas canisters recovered by protesters were stamped: “Made in USA.”
See also here.