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The Metropolitan Police say there has been no change London's threat level despite a 40% increase in the number of officers at today's Marathon.
The public are being urged to ensure they take good care of their belongings in order to avoid police responding to reports of unattended items.
Heightened security at this year's London Marathon has left spectators queuing to get past the finish line.
Hundreds of extra police officers have been drafted in to oversee the event after a terror attack at the Boston Marathon on Monday. Three people were killed and hundreds injured in two bomb blasts near the finish line.
The Metropolitan Police say the measure is meant to reassure runners.
The enhanced police presence planned for Sunday's London Marathon will remain in place despite the death and capture of the Boston Marathon bombing suspects, Scotland Yard have said.
Security has been stepped up to reassure the 36,000 runners and tens of thousands of spectators in the wake of the atrocities which killed three people and injured 180 in the US last Monday.
After a manhunt which left Boston in virtual lockdown, 19-year-old Dzhokhar Tsarnaev was arrested following a shootout with officers and his brother Tamerlan, 26, was killed yesterday.
But several hundred more officers will still be out on London's streets tomorow - a 40 percent increase on last year.
The Met is in close contact with the FBI and Boston Police and there is nothing to suggest any link with the bomb attacks.
The Boston bombings will not put off spectators or runners from taking part in tomorrow's London Marathon, the race's chief executive said.
Security has been stepped up for the 26.2 mile event in the capital with several hundred more officers set to line the streets for Sunday's marathon.
The race's chief executive Nick Bitel said: "After the terrible events in Boston we conducted a security review with the Metropolitan police and all the other agencies.
"As was announced yesterday, we have increased substantially the number of police officers who are going to be out there, going to be visibly reassuring people and putting in more search regimes and a number of other measures to ensure that it is as safe and fun as it always is."
He added: "I think the spectators won't be put off, we'll have a great day. There's some fantastic races, really competitive, and the numbers in terms of people running will be 35,500 - 36,000 as they would always be."
The Metropolitan Police have issued a statement on security plans for the London Marathon this weekend.
Chief Superintendent Julia Pendry said:
The Metropolitan Police has tweeted that it will be deploying an "increased and highly visible police presence" for the London Marathon this weekend.
There will a period of silence held before the start of the London Marathon and runners are also being encouraged to wear black ribbons after the Boston marathon blasts.
Virgin London Marathon, the organisers, have pledged to donate £2 for every finisher in the race to The One Fund Boston set up to raise money for victims of the explosions.
Roughly 35,500 people are expected to cross the finish line on The Mall, meaning at least £70,000 is likely to be raised.
Tatyana McFadden, who won the women's wheelchair race in the Boston Marathon on Monday, has confirmed she will still take part in the London Marathon and is 'running for Boston':
The number of police officers on duty for the London Marathon has been boosted by 40% to provide reassurance in the wake of the atrocities in Boston according to Scotland Yard.
Chief Superintendent Julia Pendry revealed that there will be several hundred more officers out on the streets on Sunday, an increase of two-fifths on last year.
The senior officer, who has led the Marathon security operation for five years, said: "the most important thing is that there is no link between the Boston marathon and the London Marathon.
"However people need to feel reassured when they come out on Sunday.
"It is a good 40% increase on last year on numbers of officers on the ground. We've got more search dogs out, we have got more on high visibility patrols."
British athlete Iwan Thomas said what happened at the Boston Marathon last weekend has made him more determined to run at the London Marathon this weekend.
Home Secretary Theresa May has said the Metropolitan Police put more officers on duty at the London Marathon following the Boston bombs.
Iwan told Daybreak: "I'm really looking forward to Sunday, I suppose maybe, slightly in the back of my mind something could happen but in my eyes no. I'm gonna go out there and run".