Contractor Brookfield is understood to have been told to stop work following more funding concerns over the Square Mile’s tallest tower.
Brookfield restarted work last September after developer Arab Investments put together a new finance package.
But a lack of a pre-let tenant has now caused further delays on site leaving Byrne Bros concrete cores standing idle.
A site source told Reuters: “About a week ago building work stopped.
“The bottom line is that the Pinnacle will need looking at from a funding point of view or a sizeable pre-let which is difficult in this market.”
A Brookfield spokesman declined to comment and Arab Investments was not immediately available for comment.