NEW YORK -- In a less-traveled part of the 46-acre Billie Jean King National Tennis Center, an imposing black metal fence offers a reminder of the multiple security worries that come with hosting the U.S. Open.New York Police Department counterterrorism officials insisted that the fence, near a new 8,000-seat grandstand stadium, be reinforced earlier this year with thick strands of cable capable of withstanding a crash from a truck loaded with explosives.A lot of this stuff is off the radar, but it goes back to whats happening in the world, the events security director, Michael Rodriguez, said during a flurry of last-minute preparations for Mondays opening matches.Attacks in Europe and mass shootings in the U.S. have created a climate thats added to vigilance over this years U.S. Open, which already posed daunting security challenges because of its sheer size: 700,000 spectators over two weeks packed into two stadiums, two grandstands and other seating at more than a dozen other tennis courts, all connected by sprawling pedestrian walkways.Officials say they know of no credible threats against a Grand Slam event that happens to end with the mens final on the 15th anniversary of 9/11. But the NYPD, which ordinarily has hundreds of officers in and around the tennis center, plans to increase its presence this year. Thats on top of the tournaments roughly 300 private security guards.Layers of protection include installation of temporary closed-circuit surveillance cameras, including some perched atop the 23,771-seat Arthur Ashe Stadium, along with devices to detect chemical, biological or radiation risks.Ive already warned people theyre going to see it, Rodriguez said of the extra security. And they should feel good about seeing it.Rodriguez, a former NYPD detective sergeant and supervisor for the Joint Terrorism Task Force, said he meets twice a day with representatives from the various local and federal law enforcement agencies monitoring the U.S. Open. Sample topic: the difficulties of drone mitigation.Such widening risks were underscored last year when a small drone crashed into the stands during a match -- it turned out a science teacher lost control of it while flying it in a nearby park -- and in 2014, when an NYPD intelligence analyst told a gathering of private security directors that an al-Qaida online publication encouraged a car-bomb attack on the tournament.Just outside the gates of the tennis center, the NYPD will keep heavily armed officers trained to respond to terror attacks at the ready. As with other with other events like New Years Eve in Times Square, plainclothes officers will mix with the crowds.Other defenses include strict screening checkpoints for the throng of spectators. In the past decade, the U.S. Open became among the first sporting events to prohibit backpacks and use airport-style, walk-through metal detectors instead of less-reliable wands to check people for weapons.The event also has a rigorous inspection system for the more than 1,600 trucks that make deliveries during the event. Drivers are vetted, given a bar code and directed to an inspection point deliberately located a quarter-mile from the tennis center before they can enter the grounds.Last week, United States Tennis Association officials held a meeting at the tennis center with their counterparts from the French Open and other major tournaments to discuss ways to keep spectators safe.Anything can happen, Rodriguez said. The question is, `What are we doing to minimize the risks?With success at hardening the entrances at big tournaments, security directors have turned their attention to deterring threats to the potential target created by fans congregating in the longer lines to get in, said Richard Bower, owner of Bower Events, Inc., a private security firm that consults on the BNP Paribus Open in Indian Wells, California.That event now deploys SWAT and plainclothes officers, along with police dogs, where the lines form.Part of it is about making people approaching the event feel safe, Bower said.Sally Kane, 71, of New Rochelle, one of the many fans to turn out last week for free admission qualifying matches, scoffed at the potential risks.Terrorists dont want to come here, she said. What really bothered her was having to pay to store her metal water bottle -- on a list of banned items -- outside the center.Im very annoyed, Kane said. I would have felt just as safe with my water bottle. 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VIENNA -- A city in Siberia will be stripped of hosting the 2021 world biathlon championships if Russians in the sport fail doping retests of samples taken at the 2014 Sochi Olympics.International Biathlon Union President Anders Besseberg told The Associated Press on Wednesday its possible without problem to reallocate the hosting rights from the city of Tyumen if more Russian doping infringements surface following the revelation of an alleged state-backed doping plot at the Sochi Games.WADA and IOC have commissions working on this, Besseberg said. If they should come up with things that it will be wrong, or as a kind of punishment, that you cannot organize big events in Russia, then there is absolutely no problem for us. We will have a new congress in 2018.The IBU Congress in Chisinau, Moldova, last weekend elected Tyumen to host the competition despite a recent IOC recommendation to all winter sports federations to freeze their preparations for major events in Russia and find host cities in other countries.According to Besseberg, the IOC request from July didnt apply to the 2021 biathlon worlds because its host bidding process had already started.Besseberg said the IBU and other winter sports federations received a very clear statement by the International Olympic Committee at a meeting during the Rio de Janeiro Games last month that all competitions already granted to Russia should run normally, and applications (to host an event) that were in process shall also run the normal way. This was the case for us.Therefore, two IBU events in Russia in the 2016-17 season -- the junior world championships in Ostrov in Februuary and a World Cup event in Tyumen the following month -- will go ahead as planned.ddddddddddddAlso in other winter sports, no major events have been moved from Russia so far.In a statement to the AP, the IOC said it is aware of the decision of the IBU Congress and will continue its discussions with the International Olympic Winter Sports Federations about the practical implementation of the recommendation of the IOC EB.The IOC announced earlier its recommendation was an interim order through 2016 which its board will review in December.Situated 2,500 kilometers east of Moscow, Tyumen won Sundays election by getting an absolute majority in the first round of voting, beating rival bids from Pokljuka in Slovenia and Nove Mesto in the Czech Republic.Officials from several national biathlon federations, including those of the United States, Canada and Norway, publicly criticized the choice for a Russian venue as it would send a wrong signal in the awake of the World Anti-Doping Agency inquiry report on the state-backed doping plot.When its about granting the rights for the world championships, its the sole responsibility of the delegates from the different national federations, Besseberg said, adding that none of the delegates asked questions or had any remarks during the congress when they were informed by him on the updated IOC recommendation.The voting on the candidates run in the absolutely normal way, Besseberg said.---AP Sports Writer Stephen Wilson in London contributed to this report. 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