Plans for a cycle and pedestrian bridge across the River Thames in east London have been dropped due to rising costs.
The crossing had been intended to run between Rotherhithe and Canary Wharf.
City Hall said final costs may be above £600m meaning the bridge was "currently unaffordable", so alternatives such as a ferry service would be "reassessed".
Responding to the letter, transport committee Chair Florence Eshalomi said dropping the bridge was "hugely disappointing" as it was "vital to boosting the local economy".