Al-Jazeera's offices in Cairo were firebombed today in the third day of violent protests in the city.
Reporter Ahmed el-Dassouki said several hundred protesters had approached the building on Tahrir Square and hurled Molotov cocktails.
"They accuse our network of being biased and not objective," he said.
Many protesters have attacked the broadcaster for allegedly supporting President Mohammed Morsi's Muslim Brotherhood.
Cairo police chief Osama el-Saghir was attacked when he went to address demonstrators shortly afterwards, being "driven from the square with punches and kicks" according to another police officer.
The clashes began on Monday when crowds gathered to demand justice for protesters killed by security forces a year before.
They intensified after youth activist Gaber Salah was shot in the neck.
Foreign Minister Alistair Burt's admission that the Cameron government has "supported" a survey of attitudes to US drone strikes in Pakistan's tribal areas amounts to a tacit admission of British involvement.