The London Marathon will go on as scheduled Sunday, despite the bombings and terror attacks that took place Monday at the Boston Marathon.

"The best way for us to react is to push ahead with the marathon on Sunday, to get people on the streets and to celebrate it as we always do in London," British Sports minister Hugh Robertson told the BBC on Tuesday. "These are balanced judgments but we are absolutely confident here that we can keep the event safe and secure. I think this is one of those incidents where the best way to show solidarity with Boston is to continue and send a very clear message to those responsible."

"We won't be cowered by this sort of behavior," Robertson said of the explosions during the Boston Marathon that killed three, injured over 170 and took the limbs of up to 40 more, leaving 13 more in critical condition.

The London Marathon is expected to have over 500,000 spectators.

"The London Marathon fully expects at this stage ... (to) go ahead as planned on Sunday although we are continuing to review security with the Metropolitan Police in the coming days," Nick Bitel, chief executive of the London Marathon, said Tuesday in an interview on the race website. "The London Marathon will be in touch with the runners through their email and they will hear from us on a daily basis in that way. We will try to keep updating our runners throughout this period."

There are an expected 37,500 entrants in the London Marathon.

In its 33rd year, the London Marathon is the world's largest marathon and has a flat course based around the River Thames.

"It's particularly ghastly that this should have happened on a day of great national celebration in Boston -- on a day when so many families were out on the streets and when so many people were raising millions of dollars for charity. That makes it worse. It's utterly horrifying and completely appalling," Robertson said. "It's difficult to think of a more ghastly event that this should be perpetrated upon."