With more than 30 marathons being held this weekend alone and big events on the horizon, officials around the world are boosting security efforts in the wake of the fatal bomb blasts that shook Boston’s race.

Britain was it was making last-minute efforts to tighten measures for former Prime Minister Margaret Thatcher‘s funeral on Wednesday at St. Paul’s Cathedral, which is to be attended by hundreds of diplomats and dignitaries, including Queen Elizabeth II and Price Harry.

Russian sports officials said Tuesday they will beef up security in preparation for the Winter Olympics and other events.

Police in some major U.S. cities were monitoring landmarks, government buildings, transit hubs and sporting events. Law enforcement agencies also urged the public via Twitter and Facebook to report suspicious activity to the police.

“No matter how many days, months or years pass without a major terrorist attack, it only takes one such attack to bring us back to the cruel reality,” Interpol chief Ron Noble told The Associated Press early Tuesday, saying police would be on high alert.

Although security has been increased at some U.S. and European landmarks, overall terror threat levels have remained unchanged — in contrast to other recent bombings and thwarted attacks in which terror threat levels were raised and travel advisories put in place.

“The (Boston) attacks mean that we will be assessing our security protocols,” said a British security official who spoke on condition of anonymity because he is not authorized to be publicly named. “There is some initial information coming out … but it is too early to draw any conclusions. There doesn’t appear at this point, however, to be a wider threat.”

Security was particularly tight for the big events in Britain, which has been at the heart of several terror attacks in the past decade, including suicide bombings in 2005 that killed 52 people. Several international terror plots have also been traced back to suspects in Britain.

Workers are inspecting some of the country’s 4.3 million CCTV cameras in high-traffic areas around London to ensure views are unobstructed and equipment is functioning. Workers in an underground bunker monitor the footage around the clock.

Boosting security may also include adding manpower, increasing air visibility and securing public transport routes. Police and counter-terrorism officials are also aggressively monitoring

From: http://feeds.foxnews.com/~r/foxnews/world/~3/y8zprTEMfnU/