MANAGUA, Nicaragua — The head of Nicaragua's air force is among 10 people killed when their helicopter crashed near Lake Managua.

The Nicaraguan army said in a statement Friday that air force Chief of Staff Col. Manuel Lopez was traveling with nine other top air force officials, including the chief of intelligence and counter-intelligence, when their helicopter went on Thursday.

Authorities have recovered one body from the crash, which took place in the town of La Paz Centro, about 35 miles (57 kilometers) west of Managua.

The army said the officers were returning to a military base after overseeing a training session.

It added that officials haven't determined what caused the crash.