Fighter Jet chases UFO

6:00am Saturday, June 1967, Eagan, Minnesota, south suburb of  Mpls, - St. Paul.  I was 14 years old, delivered papers now for two years.  
I just finished delivering the morning Mineapolis Star & Tribune.  A contiuous strange whistling noise lasted twenty minutes or so, like a pressure relief valve, I couldn’t figure out what it was.
Then I noticed a Saucer in the north east about a mile, mile and a half away.  Its lower section was disc-shaped silver in color, its upper section was a round flat dome with porthole lights of different colors.  It was about 60 feet in circomfrence.  The saucer was about 1000 feet above ground level, headed in a southerly direction about 150 mph.  
After 20 seconds or so I saw a fighter jet from the Air National Guard in Mpls. closing in on the saucer.  The jet closed within 600 yards of the saucer, they traveled about one and a half to two miles south.  The saucer then exicuted an ubrupt angle 45 degrees up and 45 degrees east turn and increased its speed 100 fold all in a blink of an eye.
The fighter jet then exicuted a 180 degree bank turn to the west and headed back to the air base which brought it right over head on its return leg.  The fighter jet was of a delta wing style.  The jet was approximetly the same length as the saucer, 60 feet.  
This all took place in 3 to 4 minutes.
Date in June 1967 probably is approximate, although the source of the report does not indicate that fact.  PD