AUTHORITIES ARE OFFERING A $10,000 REWARD. PRIYA SRIDHAR IS THERE. >> Reporter: TONIGHT THE MANHUNT CONTINUES FOR A SUSPECTED SHOOTER IN LAUREL COUNTY, KENTUCKY. >> OUR GOAL IS TO APPLY STEADY PRESSURE AND WEARING MR. COUCH DOWN. >> Reporter: ACCORDING TO NEWLY RELEASED COURT DOCUMENTS OBTAINED BY NBC NEWS, A WOMAN CALLED 911 30 MINUTES BEFORE THE SHOOTING TO WARN THAT 32-YEAR-OLD JOSEPH COUCH HAD TEXTED HER THAT HE WAS, QUOTE, GOING TO KILL A LOT OF PEOPLE AND THEN, QUOTE, KILL MYSELF. AUTHORITIES SAY COUCH BOUGHT AN AR-15 AND 1,000 ROUNDS OF AMMUNITION AT THIS STORE BEFORE HE DROVE EIGHT MILES AWAY AND ALLEGEDLY BEGAN RANDOMLY SHOOTING AT CARS ON THE INTERSTATE. OFFICIALS SAY COUCH SERVED IN THE ARMY RESERVE. ACCORDING TO THE DOCUMENTS, OFFICERS BEGAN TRACKING COUCH'S PHONE, WHICH LED THEM TO HIS CAR. NEARBY THEY FOUND A GREEN ARMY STYLE DUFFEL BAG WITH HIS NAME ON IT AND SEVERAL MAGAZINES OF AMMUNITION. SHAYNA LOWRY SAYS HER TRUCK WAS STRUCK IN THE GUNFIRE. >> ALL I COULD THINK ABOUT WAS MY CHILDREN AND MY SIGNIFICANT OTHER. YOU KNOW, AND THE REAL REALITY THAT I COULDN'T BE HERE. >> Reporter: NOW DOZENS OF LAW ENFORCEMENT AGENTS ARE SCOURING THE DENSELY WOODED AREA. >> WE'LL SEARCH UNTIL WE CAN FIND HIM,