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."

Latest U.S. aviation incident in June

The 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.

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.

Source: USA TODAY