A U.S. Navy reconnaissance aircraft and a Chinese military plane were involved in an "unsafe" encounter earlier this week in international airspace over the disputed South China Sea, the U.S. Pacific Command said Friday.

The U.S. Navy P-3C was on a "routine mission" over the waters on Wednesday when the encounter with a Chinese military KJ-200 aircraft occurred, Pacific Command said.

The two planes flew within 1,000 feet (300 meters) of each other in the area of the contested Scarborough Shoal, just 230 km (140 miles) from the Philippine coast, CNN reported, citing unnamed U.S. defense officials.