Two military planes crashed mid-air during training at an air base in the Philippines, killing four pilots, the air force said Saturday.
The SF-260 single propeller planes crashed at Fernando Air Base, south of Manila, on Friday afternoon.
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"Both aircraft went down within the base perimeter, with no other casualties reported," Philippine Air Force spokesman Colonel Alvin Capinguian said in a statement.
An investigation was opened to determine the cause of the mishap, and Capinguian said the air force's fleet of SF-260s has been temporarily grounded as a precaution.
There have been a number of deadly crashes involving Philippine military aircraft in recent years.
In May, two military pilots were killed when another SF-260 plane crashed during a training flight in Benguet province in the northern Philippines.