A security review is being undertaken ahead of Sunday’s London Marathon after explosions hit the Boston race – but organisers say the eventwill still go ahead.

At least three people were killed and more than 100 were injured after the blasts at the finishing line of the Boston Marathon on Monday.

The Metropolitan Police confirmed security arrangements were being reviewed in light of the tragedy in Boston.

Sports minister Hugh Robertson insisted he was “absolutely confident” the London Marathon – which passes through the East End – would be kept safe.

London Marathon chief executive Nick Bitel said: “The London Marathon has detailed security plans which are developed in conjunction with the Metropolitan Police.

“They take account of many contingencies, including this type of threat and incident, but one can’t be complacent and when it has happened, you need to then review those plans you have in place to see what else may be necessary.”