In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.
Q: The Vietnamese military is investigating the discovery of three large metal spheres that mysteriously fell from the sky in the north of the country. 
  
 The strange orbs vary in size, with the largest weighing close to 100lb, and were found at three separate locations in Vietnam’s Yen Bai and Tuyen Quang provinces last weekend. 
  
 An initial investigation by the country’s Ministry of Defence suggests the objects are metal, non-radioactive, possibly Russian in origin, and probably fell from space, Thanh Nien reported. 
  
 Local residents reported hearing what sounded like thunder several minutes before the objects crashed to earth. One sphere was found in a stream while another had its fall broken by the roof of a house before falling to the floor. 
  
 The discovery has sparked numerous bizarre theories as to what the balls could be, although experts think they are almost certainly space objects – either from a rocket or satellite that would normally have burnt up when they re-entered the atmosphere, or otherwise from a failed satellite launch. 
  
 It is not known what has led the Vietnamese to believe the objects are of Russian-origin, but the BBC said it is possible the objects – which appear largely undamaged other than a light charring - were sold to a third nation before being launched into space. 
  
 Vietnam’s Deputy Chief of Staff Lieutenant General Vo Van Tuan said he would now contact all nations with space research programs and warn them to be more careful in destroying used devices “in order to maintain security of civil aviation as well as the safety of residential areas”, according to Vietnam Net. ||||| Three mysterious metal spheres that fell from the sky and landed in northern Vietnam on Saturday have been seized by the Vietnamese military and are being investigated, Vietnamese media report. 
  
 Witnesses reported hearing thunder-like noises in the sky and seeing the objects flying up there early Saturday morning before they crash-landed, Thanh Nien News reported. 
  
 Two of the metal balls, one 250 grams and one six kilograms, landed in Yen Bai province. The smaller one hit the roof of the house, while the larger, about the size of a basketball, landed in a garden. 
  
 The third and largest by far — around 35 to 45 kilograms and about the size of an exercise or stability ball — fortunately landed away from people, near a stream in a maize field in neighbouring Tuyen Quang province. 
  
 All three were seized by Vietnam's Air Defence Arms, and are being investigated by the Ministry of Defence, VietnamNet Bridge reported Wednesday. The ministry's findings will be reported to the International Civil Aviation Organization. 
  
 The largest ball landed in a maize field near a stream, away from people. It appears to be a compressed air tank that may be from a rocket launch. (Thanh Nien News) 
  
 So far, investigators have determined that the objects are specialized compressed air tanks that may be from a rocket and that they were manufactured in Russia, although they may have subsequently been sold to other countries. They're made of metal and don't contain radioactive or explosive materials. 
  
 Earlier, Nguyen Khoa son, a professor from Vietnam's State Space Science and Technology Program, told VietnamNet Bridge that the objects might be the result of a failed satellite launch. He noted that they were intact, suggesting they fell from an altitude of less than 100 kilometres. 
  
 Strange spheres like this have previously fallen in other places around the world. Most recently, some were reported in Spain and Turkey in November. ||||| Fox/YouTube 
  
 Vietnamese authorities are currently trying to figure out a confusing mystery. Strange balls from space have plummeted to Earth in the country, and nobody can quite puzzle out what they’re doing there. 
  
 We know what these balls are, mind you. They’re Russian spheres, specifically Russian-made compressed air tanks. It’s just that these should not being falling out of the sky and crushing sheds and gardens in Vietnam. Right before these space balls landed, locals reported thunder and flying objects, which would indicate a nearby rocket launch. 
  
 So, while we can rule out aliens, unless Russia’s been holding out on us, there’s no good explanation as to why Vietnam is being hammered with space spheres. The most common theory is that a satellite launch went wrong and this is the fallout from that; due to the balls being relatively intact, they had to fall from a distance of less than 62 miles. But there are no satellite launches publicly known in this time frame, and none in the Vietnam area. True, not every satellite launch is disclosed to the public, especially if it’s a clandestine one, but it’s not clear who in the region would even be launching such a rocket. And if they were launching a rocket, where’s the rest of it? 
  
 These tanks, for now, will remain a mystery, but we’re sure somebody will come forward and claim them eventually. After all, you don’t want your space balls just out there for governments to analyze. 
  
 (Via CBC) |||||
A: 
Vietnam is being bombarded with space balls, and we aren't talking about a rerelease of the 1987 Mel Brooks classic. The CBC reports three metal balls—weighing a half-pound, 13 pounds, and about 99 pounds respectively—crash-landed in two Vietnamese provinces over the weekend. One of the balls—the smallest, fortunately—landed on a roof. The others landed near a stream and in a garden. Witnesses claim to have heard something like thunder and then looked up to see the balls flying through the air. The mysterious spheres were seized by Vietnam's Air Defense Arms, and the Ministry of Defense is investigating. Initial investigations revealed the balls are "specialized compressed air tanks," possibly from a rocket, the CBC reports. According to the BBC, they were made in Russia but may have been in use by another country. Now that they failed to land on anyone, the balls appear harmless. One expert thinks they came from a failed satellite launch and fell less than 62 miles since they aren't broken, the CBC reports. Uproxx points out no publicly known satellite launches took place near the time and place the balls fell. "It’s not clear who in the region would even be launching such a rocket," the site adds. "And if they were launching a rocket, where’s the rest of it?" A member of the Vietnamese military says he'll be telling other countries to be more careful with their space balls in the future, the Independent reports. (This video reveals how fast we've amassed space junk.)