The London Marathon, registration and all associated events will go ahead as originally planned, organisers said.
Security arrangements will continued to be reviewed in partnership with the Metropolitan Police and other authorities.
The support we have been offered by our stakeholders and the wider running community has been outstanding. We have the full support of the Metropolitan Police, the Mayor's office and other authorities.
We want to reassure our runners, spectators, volunteers and everyone connected with the event, that we are doing everything to ensure their safety and that the Virgin London Marathon 2013 is an outstanding success.
Prince Harry will attend the London Marathon this weekend despite the explosions at the Boston Marathon.
The royal, who is patron of the London Marathon Charitable Trust, will still will make the presentations to the winners of the various races including the elite men and women events.
He will also meet a selection of volunteers involved with the running of the annual event and members of the St John Ambulance.
A St James's Palace spokesman confirmed that the prince would be attending the marathon as planned but declined to comment further, he said: "As far as we're concerned there's nothing to suggest any change."
Everyone will have been appalled at the terrible events in Boston.
While the culprits and motivation behind the US terror attacks are still unclear, this will obviously entail a review of security arrangements for both Lady Thatcher's funeral and the London Marathon.
In light of the awful attacks in Boston they will require extra vigilance from everyone involved and it is also to be hoped that everyone recognises the added responsibility of co-operating with the Police and the Authorities at both events.