Very high in the atmosphere and at very high speed two objects shot across the sky.

Sun was still out in the east. Very clear day. There were 2 helicopters in my area possibly police and I was watching those when in the background and high in the sky an object flew across the sky at extreme speed. Almost like a shooting star. It was brightly lit perhaps from the reflection of the sun. Then disappeared. Moments later I saw a second craft which may have had more movement and not a straight line. Perhaps they were fighter jets or cruise missiles though to my untrained eye they appeared really high up and moving extremely fast. I couldn't hear anything though the helicopter would have masked the sound being closer and louder.