Update: It's all over - false alert, there was no device. The bridge has reopened.
Tower Bridge was closed this afternoon while City of London Police dealt with a "suspect package". Traffic was prevented from entering the busy crossing, while boats were stopped from passing under the structure. Pedestrians were not allowed near it.
We are currently dealing with a suspect package on #TowerBridge. The bridge is closed to all traffic and pedestrians.
— City Police (@CityPolice) July 17, 2015
Office workers nearby and construction staff working on buildings were also evacuated. Sniffer dogs were on the scene. The bridge reopened around 4.20pm.