A pilot was killed and two other people were injured on Friday after an accident involving two planes on the runway at the Laughlin Air Force Base in Del Rio, Texas.

The accident took place around 10:00 a.m. local time. The “mishap” involved two T-38C Talon trainer aircraft, according to a news release from the 47th Flying Training Wing at the air force base.

The base is located on the U.S.-Mexico border.

“Losing teammates is unbelievably painful and it is with a heavy heart I express my sincere condolences,” Col. Craig Prather, commander of the training wing, said in a statement. “Our hearts, thoughts, and prayer are with our pilots involved in this mishap and their families.”

According to the press announcement, one of the injured pilots was treated and released from Val Verde Regional Medical Center in Del Rio. The other pilot was flown to Brooke Army Medical Center in San Antonio, where he remains in critical condition.

The names of all the pilots involved in the crash have been withheld until their relatives have been notified, which will take up to 24 hours.