1.   These are only unsubstantiated rumours.

2.   ...unsubstantiated rumours about his private life.

3.   This is an unsubstantiated rumour but there are complaints that the leatherback turtles have stopped coming to Cherating as a result of this.Talk about a crowd-stopper.

4.   Dealers said there was no fundamental reason for the gain, other than unsubstantiated rumours of strong third quarter results.

5.   This tension has been fuelled by unsubstantiated rumours that neither the incumbent regime nor the opposition would take defeat lying down.

6.   Mladic has been a reclusive figure since the end of the Bosnian war, sparking unsubstantiated rumours that he is in poor health.

7.   Mladic has become a reclusive figure in post-war Bosnia, sparking unsubstantiated rumours of strokes, drinking binges, and general ill-health.