TEHRAN, Iran (AP) -- The body of the nephew of Iran's opposition leader -- slain in the deadliest day of anti-government protests in months -- disappeared from a hospital Monday, and security forces detained at least seven prominent activists, opposition reports said. Iranian state television reported that eight people had died in the street violence Sunday, but independent confirmation of the casualty toll was virtually impossible because of curbs on media coverage. Tehran residents say restrictions on Internet access were intensified, and Iranians were unable to see opposition Web sites. Cell phone and text messaging services were sporadic.