Hundreds of demonstrators began on Sunday night to block entrances and exits of most bridges in Cairo in protest against the speech President Mohamed Mursi gave earlier.
Protesters torched car tires and used them to block the entrances and exits, an Aswat Masriya eyewitness said.
Demonstrators at the Corniche and Maspero (state radio and TV building) area are protesting against Mursi's speech, the eyewitness added.
In his speech, President Mursi enforced emergency law in three Suez Canal governorates for 30 days and called for dialogue with prominent politicians on Sunday.