We are treating Jordan (Cobb) as a high risk missing person and we are working with the coastguard to try and locate him.
The river was extensively searched by air and sea for several hours, but there remains a possibility that he managed to swim ashore, and I would ask anyone with information to call the police on 101.
The search for the missing teenager has resumed this morning.
More top news
Nearly 38,000 runners will hope to complete Sunday's London Marathon making it the biggest event in its 35-year history.
Rain across central Britain with longer, intense downpours with thunder in places this evening. A lucky few will stay sunny and dry.
Planning on going to the London Marathon tomorrow? Read our handy guide first!