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Police shoot dead suspected extremist accused of killing 2 Swedes in Brussels_我的网站

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A | 据外媒报道，去年，洛克希德·马丁公司开始测试一种针对未来战机的新型激光炮塔。 BRUSSELS -- Police in Belgium on Tuesday shot dead a suspected Tunisian extremist accused of killing two Swedish soccer fans in a brazen shooting on a Brussels street before disappearing into the night. Hours after a manhunt began in the Belgian capital, Interior Minister Annelies Verlinden told broadcaster VRT: “We have the good news that we found the individual.” She said that the weapon believed to have been used in the shooting was recovered.The federal prosecutor’s office was more cautious, saying in a text message to The Associated Press: “There are strong presumptions but no certainties” that the man was the shooter. He was shot by police in the Schaerbeek neighborhood where the rampage had taken place.Amateur videos posted on social media of Monday’s attack showed a man wearing an orange fluorescent vest pull up on a scooter, take out a large weapon and open fire on passersby before chasing them into a building to gun them down.“Last night, three people left for what was supposed to be a wonderful soccer party. Two of them lost their lives in a brutal terrorist attack,” Prime Minister Alexander De Croo said at a news conference just before dawn. “Their lives were cut short in full flight, cut down by extreme brutality.”De Croo said his thoughts were with the victims’ families and that he had sent his condolences to the Swedish prime minister. Security has been beefed up in the capital, particularly around places linked to the Swedish community in the city.“The attack that was launched yesterday was committed with total cowardice,” De Croo said. Not far from the scene of the shooting, the Belgium-Sweden soccer match in the Belgian national stadium was suspended at halftime and the 35,000 fans held inside as a precaution while the attacker was at large.Prosecutor Eric Van Duyse said “security measures were urgently taken to protect the Swedish supporters” in the stadium. More than two hours after the game was suspended, a message flashed on the big stadium screen saying, “Fans, you can leave the stadium calmly.” Stand after stand emptied onto streets filled with police as the search for the attacker continued.“Frustrated, confused, scared. I think everyone was quite scared,” said Caroline Lochs, a fan from Antwerp.De Croo said the assailant was a Tunisian man living illegally in Belgium who used a military weapon to kill the two Swedes and shoot a third, who is being treated for ”severe injuries."Federal Prosecutor Frederic Van Leeuw described how the suspect, a 45-year-old man who wasn't identified, had posted a video online claiming to have killed three Swedish people. The suspect is alleged to have said in the video that, for him, the Quran is “a red line for which he is ready to sacrifice himself.”Sweden raised its terror alert to the second-highest level in August after a series of public Quran-burnings by an Iraqi refugee living in Sweden resulted in threats from Islamic militant groups.Belgian prosecutors said overnight that nothing suggested the attack was linked to the latest war between Israel and Hamas.Police overnight raided a building in the Brussels neighborhood of Schaerbeek where the man was thought be staying but did not find him. Sweden’s foreign ministry sent out a text message to subscribers in Belgium asking them “to be vigilant and to carefully listen to instructions from the Belgian authorities.”According to Justice Minister Vincent Van Quickenborne, the suspect was denied asylum in 2019. He was known to police and had been suspected of involvement of human trafficking, living illegally in Belgium and of being a risk to state security.Information provided to the Belgian authorities by an unidentified foreign government suggested that the man had been radicalized and intended to travel abroad to fight in a holy war. But the Belgian authorities were not able to establish this, so he was never listed as dangerous.The man was also suspected of threatening a person in an asylum center and a hearing on that incident had been due to take place on Tuesday, Van Quickenborne said.Belgian Asylum State Secretary Nicole de Moor said the man disappeared after his asylum application was refused so the authorities were unable to locate him to organize his deportation.A terror alert for Brussels was raised overnight to 4, the top of Belgian's scale, indicating an extremely serious threat. It previously stood at 2, which means the threat was average. The alert level for the rest of the country was raised to 3. De Croo said that Belgium would never submit to such attacks. “Moments like this are a heavy ordeal," he told reporters, "but we are never going to let ourselves be intimidated by them.” ___Associated Press writer Sam Petrequin contributed to this report.。日前，这家公司披露，他们经过60次的飞行测试之后认定该炮塔系统具备了360度攻击的能力，这意味着这种技术离实际部署又进了一步。据了解，虽然该领域研究人员将激光视为具备穿透空气的光线，但同时空气也是它面对的最大问题之一。

B | 比如说在湍流效应的下激光就只能打击正前方的目标。为了应对这一问题，洛克希德·马丁公司研发出了航空自适应气动光学光束控制(ABC)炮塔。这套专门为DARPA和美国空军研究实验室(AFRL)研发的炮塔使用了一套光学补偿系统，它由一组可变性反射镜组成，并结合了空气动力学及控流技术，以此来解决湍流问题。

C | 这给了炮塔可360度打击目标的能力。据洛克希德·马丁公司介绍，自去年开始，他们通过一台安装在双引擎商用飞机的激光器进行了60次测试。公司导弹系统、高级项目、战略与导弹防御系统副总裁Doug Graham表示：“这套先进的炮塔设计将能让战术飞机拥有跟地面和海洋军事交通工具一样的激光武器系统优势。这展示了洛克希德·马丁如何使用各种创新技术将激光武器转变成综合武器系统的一个范例。

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