I was reading on my deck around 7 o'clock. i am told that military pilots train in the mountains around where i live and i've always enjoyed seeing them fly through. this happens all the time, jets and helicopters are a common sighting. so i naturally saw the jet and did a double take, because there was something following it. i immediately thought i was witnessing some strange aircraft, possibly military but it was not a jet. i knew it wasn't a jet because it was actually right behind one. the jet it was chasing left a long contrail behind it, but the ufo did not. the ufo was gaining on a jet. no helicopter could do that. i was blown away and luckily got out my phone in time to take a video. i watched the object gaining on the jet for about 10 seconds when i lost them in the trees. i was very excited and anxious. i felt i has witnessed something very hard to dismiss as a "weather balloon" or some obvious type of aircraft. shortly after the jet and object left my range of sight i saw 3 more jets and 1 helicopters going the same direction (in my opinion chasing the ufo). i also got another video of those other aircraft. i would like to show the video to an aviation expert and maybe get an explanation. i'm uploading to mufon hoping for answers.