While flying over Pisco, Peru, we noticed 3 very bright large objects. They were not moving much. They passed by us at a distance of 20-30 miles at approximately 20,000 feet. We were at 31,000 feet. There were 4 crew members on our B767-300ER. All noticed it. There also was a Mexicana Airliner overhead that noticed the objects as well. They were to large to be ships. They were over the ocean and very bright. We called the local air traffic controllers in Lima and they did not see them on radar.