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In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.

U.S. military personnel prepare to transfer an injured on board USS Fitzgerald, off Izu Peninsula, Japan, after the Navy destroyer collided with a merchant ship, Saturday, June 17, 2017. The Japan... (Associated Press) 
  
 YOKOSUKA, Japan (AP) — U.S. and Japanese vessels and aircraft were searching Saturday for seven American sailors who were missing after their Navy destroyer collided before dawn with a container ship four times its size off the coast of Japan. 
  
 The USS Fitzgerald was back at its home port in Yokosuka Naval Base south of Tokyo by sunset Saturday, its crew lined up on deck. The Philippine-flagged container ship was berthed at Tokyo's Oi wharf, where officials began questioning crew members about the cause of the nighttime crash. 
  
 After helping stabilize the USS Fitzgerald, the destroyer USS Dewey joined other American and Japanese vessels and aircraft in the search for the missing sailors. 
  
 At least three other Navy sailors were injured in the collision. 
  
 Family members were frantically seeking news, appealing via social media for calls from sailors aboard from the ship. 
  
 The U.S. 7th Fleet said in a statement that the crash damaged two berthing spaces, a machinery room and the radio room. Most of the more than 200 sailors aboard would have been asleep in their berths at the time of the pre-dawn crash. 
  
 Water was being pumped out of flooded areas and it was unclear how long it would take to get into the crushed mid-right side of the ship once it was at the pier in Yokosuka, the statement said. 
  
 The USS Fitzgerald's captain, Cmdr. Bryce Benson, was airlifted early Saturday to the U.S. Naval Hospital in Yokosuka and was in stable condition with a head injury, the Navy said. Two other crew members suffered cuts and bruises and were evacuated. It was unclear how many others may have been hurt. 
  
 The Navy said that the collision occurred 56 nautical miles (103 kilometers) southwest of Yokosuka, home to the 7th Fleet. 
  
 "Right now we are focused on two things: the safety of the ship and the well-being of the sailors," said Adm. Scott Swift, commander of the U.S. Pacific Fleet. 
  
 The Japanese coast guard said it received an emergency call from the container ship, the ACX Crystal, reporting the collision at around 2:20 a.m. (1720 GMT Friday). It was questioning crew members of the ACX Crystal, which is operated by the Japanese shipping company Nippon Yusen K.K., and was treating the incident as a case of possible professional negligence, said Masayuki Obara, a regional coast guard official. 
  
 The ACX Crystal weighs 29,060 tons and is 222 meters (730 feet) long, the coast guard said, much larger than the 8,315-ton Navy destroyer. The container ship's left bow was dented and scraped, but it did not appear to have sustained any major structural damage. 
  
 Nippon Yusen said all of the ACX Crystal's 20-member Filipino crew members were safe. 
  
 Conditions were clear at the time of the collision, though Yutaka Saito of the coast guard said the area is particularly busy with sea traffic. 
  
 The names of the missing sailors were being withheld pending notification of their families. U.S. Navy personnel set up support and counseling services to help families as they sought updates on crew members. 
  
 "Just heard the sweetest voice and saw a wonderful face. He's okay. Thank you all for the prayers," Rita Schrimsher of Athens, Alabama, tweeted after speaking with her 23-year-old grandson, Jackson Schrimsher, via Facetime. 
  
 "It could have been worse, so we're grateful," she said by phone. 
  
 ___ 
  
 Associated Press writers Mari Yamaguchi and Elaine Kurtenbach in Tokyo and Cathy Bussewitz and Jennifer Kelleher in Honolulu contributed to this report. ||||| Tokyo (CNN) Seven US sailors are missing and the commanding officer of a US destroyer is among the injured after the warship and a merchant ship collided off the coast of Japan, the US Navy said. 
  
 The smaller guided-missile destroyer USS Fitzgerald suffered severe damage to its starboard side. 
  
 "The collision affected Fitzgerald's forward starboard side above and below the water line, causing significant damage and associated flooding to two berthing spaces, a machinery space, and the radio room," according to a statement from US 7th Fleet. 
  
 The statement hinted that the missing sailors could be trapped in the damaged area of the destroyer. 
  
 "It remains uncertain how long it will take to gain access to the spaces once the ship is pier side ... to methodically continue the search for the missing," the statement said. 
  
 The two ships collided around 1:30 a.m. local time Saturday in the Pacific Ocean, about 56 nautical miles southwest from the port of Yokosuka and 12 miles off the Izu Peninsula, the Japanese coast guard said. 
  
 The USS Fitzgerald heads to Yokosuka, home base of the 7th Fleet, beside a US tugboat, off Shimoda, Japan on Saturday. 
  
 The Fitzgerald had left the US naval base in Yokosuka, where it is based, earlier Friday for routine operations in the area, a US Naval Forces Japan spokesman said. 
  
 The warship was towed back to Yokosuka, escorted by a Japanese coast guard ship, naval officials said. It arrived at port late Saturday, when divers began inspecting the damage. 
  
 Earlier, the ship's commander, Cmdr. Bryce Benson, was evacuated by a Japanese naval helicopter while US military copters evacuated two injured US sailors. All three are in stable condition at the US Naval Hospital in Yokosuka, said Cmdr. Ron Flanders, public affairs officer for US Naval Forces Japan. 
  
 Five Japanese Maritime Self Defense force ships were leading the search for the missing US sailors at the site of the collision, joined by another US warship, the guided-missile destroyer USS Dewey, the 7th Fleet said. US and Japanese aircraft also were involved. 
  
 No one hurt on merchant ship 
  
 The merchant vessel involved is the ACX Crystal, a container ship flagged in the Philippines, officials said. It is chartered by Japanese shipping company Nippon Yusen Kabushiki Kaisha (NYK) and owned by Dainichi-Invest Corporation, NYK said. 
  
 A photo from shipping company NYK shows damage from the collision. 
  
 No one aboard the Crystal was hurt, and no oil spilled from the vessel, NYK said. 
  
 NYK and the ship's owner are cooperating a Japan Coast Guard investigation into the collision, the shipping firm said. 
  
 "Our thoughts and deep concerns go out to all those directly affected," NYK said. 
  
 The ship-tracking website marinetraffic.com shows the ship had left the Japanese port of Nagoya on Friday evening. It was expected to dock at a Tokyo Bay port around 4:30 p.m. local time, officials said after the wreck, adding that the container ship was operating under charter to a Japanese shipping company. 
  
 Photos of the Crystal showed damage to its bow. 
  
 Damage to the Philippine container ship ACX Crystal is seen after it collided with the USS Fitzgerald in the waters off Izu Peninsula, this photo released by Japan's coast guard shows. 
  
 Shipping zone can be precarious 
  
 The area where the wreck happened is known for heavy maritime traffic, the Japanese coast guard said. About 400 to 500 ships pass through the zone each day, the service said. 
  
 The last known fatal incident there was in September 2015, when a South Korean vessel and a Japanese container ship collided, Japan's coast guard reported. Six Japanese crew were declared dead. 
  
 The area has seen two other major collisions in the past five years. 
  
 In such a busy shipping lane, the ships may have been in a "restricted navigation" situation, meaning they would have had o observe strict rules for movement and positioning in relation to other vessels in their vicinity, said Carl Schuster, former director of operations at the US Pacific Command's Joint Intelligence Center and a Hawaii Pacific University professor. 
  
 Those rules leave vessels little room to maneuver, as turning away from one ship could place a vessel at risk of an even more serious incident with another, Schuster said. 
  
 It completed $21 million in upgrades and repairs in February and is forward-deployed to Yokosuka, supporting security and stability in the Indo-Asia-Pacific region, the service said. 
  
 The 29,000-ton container ship, which handles general cargo, includes a captain and a crew of 20, NYK said. It was built in 2008 and is about 730 feet long. 
  
 The larger size of the container ship could have left the smaller US destroyer vulnerable in the collision, Schuster said. 
  
 An injured USS Fitzgerald crew member is carried by US military personnel, left, and Japanese Maritime Self-Defense Force members upon arriving Saturday to the US Naval Base in Yokosuka Japan. 
  
 The force of the impact could have thrown overboard sailors who were standing on the opposite side of the destroyer from where it was struck, he said. That could account for the missing sailors, who may have been on deck on watch or even just relaxing in the night air, he said. 
  
 Sailors also could have been trapped in compartments below deck, Schuster said, pointing out that container ships have a bulbous bow below the water line, which may have plowed into the US warship. 
  
 Experienced commander in charge 
  
 Benson, the Fitzgerald's commander, was new to the position, having taken command of the vessel May 13 after serving as the ship's executive officer, or second in command, since November 2015, the Navy said last month. 
  
 Cmdr. Bryce Benson 
  
 The Fitzgerald is the second command for Benson, a 1999 Naval ROTC graduate of Marquette University. He commanded the minesweeper USS Guardian, operating out of Sasebo, Japan, from 2008 to 2010, before taking shore assignments in Washington and with US Pacific Command. 
  
 The collision was the second in the region for US Navy warship in just more than a month. On May 9, the guided-missile cruiser USS Lake Champlain was struck by a South Korean fishing boat off the Korean Peninsula. 
  
 No injuries were reported in that incident, which a Navy official said occurred when the fishing boat's crew did not have a radio to hear warnings from the US warship. 
  
 The guided-missile cruiser USS Antietam ran aground in late January while anchoring near Yokosuka, damaging its propellers and discharging 1,100 gallons of hydraulic oil into the bay. 
  
 Correction: An earlier version of this article incorrectly described the status of the commanding officer. He was transported by medevac for treatment. |||||
Output:
US and Japanese vessels and aircraft are searching for seven American sailors who are missing after their Navy destroyer collided before dawn with a container ship four times its size off the coast of Japan. The USS Fitzgerald was back at its home port in Yokosuka Naval Base south of Tokyo by sunset Saturday, following the crash at 2:20am local time. The USS Fitzgerald's captain, Cmdr. Bryce Benson, was airlifted early Saturday to the US Naval Hospital in Yokosuka and was in stable condition with a head injury; two other crew members suffered cuts and bruises and were evacuated, reports the AP. The US 7th Fleet said in a statement that the crash damaged two berthing spaces, a machinery room, and the radio room, and CNN says its statement suggests the missing could be in the ship's crushed mid-right side. "It remains uncertain how long it will take to gain access to the spaces once the ship is pier side ... to methodically continue the search for the missing," the statement said. Most of the more than 200 sailors aboard would have been asleep in their berths at the time of the pre-dawn crash. The Navy said that the collision occurred 56 nautical miles southwest of Yokosuka, home to the 7th Fleet. The ACX Crystal weighs 29,060 tons, making it much larger than the 8,315-ton Navy destroyer. The container ship's left bow was dented and scraped, but it did not appear to have sustained any major structural damage. The Philippine-flagged container ship was berthed at Tokyo's Oi wharf, where officials began questioning crew members about the cause of the crash and are treating the incident as a case of possible professional negligence.