EIGHT ORANGE AND RED LIGHTS OVER PEKIN, IL.MY SON WAS OUT IN BACK YARD OF MY MOTHERS HOUSE WHEN HE RAN IN THE HOUSE AND SAID HURRY AND LOOK AT THESE LIGHTS MOVING SOUTH TO NORTH.MY MOTHER AND I WENT OUTSIDE TO LOOK AND SAW 4 TRIANGLE SHAPE ORANGE AND RED LIGHTS. THEY WERE ABOUT 1500 FEET UP AND MOVING UNDERNEATH A HEAVY CLOUD COVER.WE HAVE HAD HEAVY RAINS MOST OF THE DAY AND CLOUD CEILING WAS LOW. THE 4 LIGHTS WERE MOVING VERY SLOW IN A STRAIGHT FLIGHT PATH ONE BEHIND THE OTHER. THEY ALMOST CAME TO A STOP THEN ONE AFTER THE OTHER THEY DISAPPEARED. ONE MINUTE LATER ANOTHER GROUP OF 4 CAME BY ON SAME FIGHT PATH , WITH THE LAST LIGHT SPACED FARTHER BACK. THEY DISAPEARED AT THE SAME LOCATION AS THE FIRST FOUR DID. THEY MADE NO SOUND.10 MINUTES LATER WE HEARD WHAT SOUNDED LIKE TO JETS MOVING AT FAST SPEED. MY MOTHERS HOUSE IS UNDER THE FLIGHT PATH TO THE PEORIA AIRPORT, SO WE ARE USE TO SEEING AND HEARING AIRCRAFT ALL THE TIME. WHAT EVER THEY WERE I HAVE NEVER SEEN ANY THING LIKE THESE. WE ARE A AIRFORCE ! FAMILY AND QUITE FAMILAR WITH AIRCRAFT.