PMQs: Dodds and Cameron on Northern Irish security
The DUP's Nigel Dodds said Northern Ireland had "gone beyond the tipping point" over the devolution problems, and he called for Sinn Fein "to be dealt with".
David Cameron said there can be "no justification for paramilitary organisations and structures", and warned they they were "not wanted and should be disbanded".
They were speaking at PMQs after three senior republicans, including Bobby Storey, the northern chairman of Sinn Féin, were arrested in connection with the murder of former IRA man Kevin McGuigan Sr.