Bahrain's opposition al-Wefaq group said today it had "little hope" of a breakthrough in talks with the autocratic government.
Leader Sheik Ali Salman admitted that some protesters had begun to resort to violent tactics, including petrol bombs, after 21 months during which the state has ruthlessly crushed pro-democracy demonstrations, including by calling in the Saudi Arabian army.
Mr Salman said al-Wefaq disapproves of violence but can't rein in increasingly desperate demonstrators in the tiny Gulf kingdom, which hosts the US Fifth Fleet and buys lots of British weapons.
Unrest broke out again on Saturday as police clashed with mourners at the funeral of a teenager killed on Friday.
The boy was hit by a car and opposition groups say he was fleeing from police at the time.
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.