Syria's exiled Muslim Brotherhood has urged UN chief Ban Ki-moon to acknowledge that Damascus had failed to honour a peace plan and to suspend its membership of the world body.

"We ask Ban Ki-moon to announce that Assad's government has failed to honour the peace plan and to declare the plan finished ... at a time when dozens of innocent people are dying," the group said in a statement issued in the UK on Friday.

It also called for "the freezing of Syria's membership in the international organisation, until a transitional government that represents the Syrian people's will is established."

The Brotherhood, which is banned in Syria but represented in the opposition Syrian National Council, said the UN should sever all ties with Assad's government, which it said was made up of "hooligans that have taken over the state and Syrian society." [AFP]