U.S. forensic scientists have identified the remains of two soldiers killed in the Korean War, Secretary of Defense James Mattis told reporters on Tuesday.

North Korea returned 55 sets of remains to the U.S. in July, as part of the agreement signed by the two countries’ leaders in Singapore the previous month.

“It’s been good work done, they moved swiftly on a couple where they thought they had a better chance for a number of reasons, where the remains came from, and what background we had, and how much we had to work with,” Mattis told reporters at the Pentagon.

“There’s