Three defense contractors and one U.S. military service member were killed Thursday in a plane crash in the Province of Maguindanao del Sur, Philippines.

“The aircraft was providing intelligence, surveillance, and reconnaissance and crashed during a “routine mission,” according to a statement from U.S. Indo-Pacific Command. “We can confirm no survivors of the crash. There were four personnel on board, including one U.S. military service member and three defense contractors.”

The military has not released the identities of those who were killed due to its efforts to notify their next of kin. It is investigating the cause of the crash.

The aircraft that crashed was a U.S. Marine Corps Beechcraft King Air 350, according to Fox News.

CLICK HERE TO READ MORE FROM THE WASHINGTON EXAMINER

A day earlier, Defense Secretary Pete Hegseth held an introductory call with Philippine Secretary of National Defense Gilberto Teodoro.

“The leaders discussed the importance of reestablishing deterrence in the South China Sea, including by working with allies and partners. They also discussed enhancing the capability and capacity of the Armed Forces of the Philippines,” said Pentagon spokesman John Ullyot in a statement.