Threat to SF leaders from disaffected IRA members?

An interesting report from RTÉ’s Northern Editor, Tommie Gorman [RealPlayer video] notes that “Senior figures in Sinn Féin, including Gerry Adams, Martin McGuinness and Gerry Kelly, have stepped up their security in recent weeks for fear that an attempt may be made to kill them.” It seems to be in response to their own assesment of the threat posed by “disaffected IRA members” linking up with dissident republican groups.
From the report’s accompanying text

RTÉ News understands that the party’s leadership believes that a number of disaffected IRA members have established contact with dissident republicans and that they are opposed to any change in Sinn Féin’s policy on policing.