KUALA LUMPUR, Malaysia (AP) – Vietnamese air force planes today spotted two large oil slicks close to where a Malaysia Airlines Boeing 777 went missing earlier in the day, the first sign that the aircraft carrying 239 people had crashed. The air force planes were part of a multinational search operation launched after Flight MH370 fell off radar screens less than an hour after it took off from Kuala Lumpur for Beijing early this morning. The oil slicks were spotted late today off the southern tip of Vietnam and were each between 10 kilometres and 15 kilometres long, the Vietnamese government said in a statement. There was no confirmation that the slicks were related to the missing plane, but the statement said they were consistent with the kinds that would be produced by the two fuel tanks of a crashed jetliner. Two-thirds of the missing plane’s passengers were from China, while others were from elsewhere in Asia, North America and Europe. Malaysia Airlines CEO Ahmad Jauhari Yahya said there was no indication that the pilots had sent a distress signal, suggesting that whatever happened to the plane occurred quickly and possibly catastrophically. At Beijing’s airport, authorities posted a notice asking relatives and friends of passengers to gather at a nearby hotel to wait for further information, and provided a shuttle bus service. A woman wept aboard the bus while saying on a mobile phone, “They want us to go to the hotel. It cannot be good.” Relatives and friends of passengers were escorted into a private area at the hotel, but reporters were kept away. A man in a grey hooded sweatshirt later stormed out complaining about a lack of information. The man, who said he was a Beijing resident but declined to give his name, said he was anxious because his mother was on board the flight with a group of 10 tourists. “We have been waiting for hours and there is still no verification,” he said. Malaysian Prime Minister Najib Razak said that Malaysia had dispatched 15 planes and nine ships to the area, and that the United States Navy was sending some planes as well. Singapore, China and Vietnam also were sending aircraft. It’s not uncommon for it to take several days to find the wreckage of aircraft floating on the ocean. Locating and then recovering the flight data recorders, vital to any investigation, can take months or even years. After the oil slick was spotted, the air search was suspended for the night and was to resume Sunday morning, while the sea search was ongoing, Malaysia Airlines said. The plane was carrying 227 passengers, including two infants, and 12 crew members, the airline said. It said there were 152 passengers from China; 38 from Malaysia; seven from Indonesia; six from Australia; five from India; three from the U.S., and others from Indonesia, France, New Zealand, Canada, Ukraine, Russia, Italy, Taiwan, the Netherlands and Austria.