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A U.S. Coast Guard helicopter crashed on June 22 during a training flight in Sitka, Alaska, injuring all four crew members, officials said.A Coast Guard MH-60 Jayhawk from Air Station Sitka went down during a training flight near Harbor Mountain, according to a news release from the Coast Guard Arctic District. Sitka Fire and Rescue crews arrived at the crash site at about 11 a.m. local time and transported all four crew members to Mt. Edgecumbe Medical Center.The conditions of the aircrew members were not immediately known. No deaths were reported, and the cause of the crash is currently under investigation, the Coast Guard said.Watch standers at the Coast Guard Arctic District command center received a report of the crash at around 10:07 a.m. local time, according to the Coast Guard. Earlier, the agency said it was "actively responding to a reported crash" that occurred in Sitka."The safety, well-being, and rescue of our crew members is our absolute, immediate priority," the agency said in a statement on social media. "A formal investigation will be conducted to determine the circumstances surrounding the event."Sitka, a city-borough located in southeast Alaska, has a population of over 8,300 people. The city and borough are spread over several islands, and are about 95 air miles southwest of Juneau, the state's capital.Latest aviation incident in JuneThe helicopter crash comes amid heightened national attention on aviation safety following a series of major aviation incidents that have occurred across the United States this month. The plane crashes occurred within days of each other, and involved different types of aircraft — a private jet, a skydiving plane, and two military jets — with experts saying they are unlikely to be connected.Dr. Kristy Kiernan, associate director of Embry-Riddle Aeronautical University's Boeing Center for Aviation and Aerospace Safety, said such clusters can raise immediate concerns, but early indications suggest the incidents are not connected and reflect vastly different circumstances."In this case, you have four situations that involve different aircraft, different engines, different operators, different regulatory structures that they operate under. Almost everything that could be different in terms of the context and the environment is different," Kiernan previously told USA TODAY, adding that it is "extremely unlikely to derive from a common issue."The crashes include:June 13: A U.S. Marine Corps F/A‑18 Hornet crashed in Washington state, sparking a wildfire but leaving the pilot with only minor injuries, according to local authorities and military officials. The pilot ejected from the aircraft and was recovered by the local sheriff’s department, according to the Marine Corps.June 14: A skydiving plane crashed shortly after takeoff on June 14 in Missouri, killing all 12 people on board, authorities said. The aircraft was carrying a pilot and 11 passengers preparing for a skydiving outing when it went down near the airport and burst into flames.June 15: A U.S. Air Force B‑52 Stratofortress bomber "crashed and burst into flames" shortly after takeoff from Edwards Air Force Base in Southern California, killing all eight people on board, military officials said. The incident occurred while the aircraft was on a test mission in support of a radar modernization program.June 16: A small business jet crashed onto a highway in a southern Texas city along the Mexico border after the aircraft reported mechanical issues, according to authorities. Six people were on board the plane, including one person who was killed in the incident, police said.Each incident remains under separate investigation by federal or military authorities, officials have said.Other aviation incidents have also been reported in recent days. USA TODAY reported that the Federal Aviation Administration is investigating a near miss that occurred at Boston Logan International Airport on June 20. A Delta Air Lines flight from Dallas was forced to abort its landing in Boston because another aircraft was departing from an intersecting runway.Over the weekend, authorities said a total of eight people were killed in separate plane crashes that occurred in Maryland, Ohio, and Kentucky, according to reporting from ABC News, local television station WKYC, and the Lexington Herald-Leader.Contributing: Zach Wichter