GIANT DRONES FLYING IN FORMATION AND NOBODY SEEMS TO KNOW WHY.

FORMATION AND NOBODY SEEMS TO KNOW WHY. GADI SCHWARTZ REPORTS.

SEEMS TO KNOW WHY. GADI SCHWARTZ REPORTS. >> Reporter: TONIGHT,

GADI SCHWARTZ REPORTS. >> Reporter: TONIGHT, A GROWING MYSTERY IN

>> Reporter: TONIGHT, A GROWING MYSTERY IN THE NIGHT SKY OVER

A GROWING MYSTERY IN THE NIGHT SKY OVER COLORADO.

THE NIGHT SKY OVER COLORADO. FLEETS OF UNIDENTIFIED

COLORADO. FLEETS OF UNIDENTIFIED DRONES REPORTEDLY

FLEETS OF UNIDENTIFIED DRONES REPORTEDLY FLYING IN GRID

DRONES REPORTEDLY FLYING IN GRID PATTERNS EVEN SPOTTED

FLYING IN GRID PATTERNS EVEN SPOTTED BY LAW ENFORCEMENT.

PATTERNS EVEN SPOTTED BY LAW ENFORCEMENT. >> I HAD A DRONE

BY LAW ENFORCEMENT. >> I HAD A DRONE PASSOVER ME.

>> I HAD A DRONE PASSOVER ME. >> Reporter: SOME

PASSOVER ME. >> Reporter: SOME RESIDENTS GIVING

>> Reporter: SOME RESIDENTS GIVING CHASE.

RESIDENTS GIVING CHASE. >> WE GOT CLOSE TO

CHASE. >> WE GOT CLOSE TO ONE, AND IT DESCENDED,

>> WE GOT CLOSE TO ONE, AND IT DESCENDED, I SWEAR IT GOT CLOSER

ONE, AND IT DESCENDED, I SWEAR IT GOT CLOSER TO US AND THEN THE

I SWEAR IT GOT CLOSER TO US AND THEN THE LIGHTS SHUT OFF.

TO US AND THEN THE LIGHTS SHUT OFF. >> Reporter: SO FAR

LIGHTS SHUT OFF. >> Reporter: SO FAR THIS VIDEO THEY SHOT

>> Reporter: SO FAR THIS VIDEO THEY SHOT IS THE BEST EVIDENCE

THIS VIDEO THEY SHOT IS THE BEST EVIDENCE TO EMERGE.

IS THE BEST EVIDENCE TO EMERGE. THE SIGHTINGS REPORTED

TO EMERGE. THE SIGHTINGS REPORTED ACROSS FIVE COUNTIES

THE SIGHTINGS REPORTED ACROSS FIVE COUNTIES IN COLORADO AS MANY AS

ACROSS FIVE COUNTIES IN COLORADO AS MANY AS 30 DRONES FLYING IN

IN COLORADO AS MANY AS 30 DRONES FLYING IN FORMATION SOME WITH

30 DRONES FLYING IN FORMATION SOME WITH WINGSPANS ESTIMATED AT

FORMATION SOME WITH WINGSPANS ESTIMATED AT SIX FEET WITH THE FAA

WINGSPANS ESTIMATED AT SIX FEET WITH THE FAA SAYING THEY DON'T HAVE

SIX FEET WITH THE FAA SAYING THEY DON'T HAVE ANY CONCRETE

SAYING THEY DON'T HAVE ANY CONCRETE INFORMATION TO ACT ON.

ANY CONCRETE INFORMATION TO ACT ON. ON FACEBOOK, SOME

INFORMATION TO ACT ON. ON FACEBOOK, SOME RESIDENTS ASKING CAN

ON FACEBOOK, SOME RESIDENTS ASKING CAN WE SHOOT THEM DOWN IF

RESIDENTS ASKING CAN WE SHOOT THEM DOWN IF OVER OUR PROPERTY?

WE SHOOT THEM DOWN IF OVER OUR PROPERTY? BUT AUTHORITIES WARN

OVER OUR PROPERTY? BUT AUTHORITIES WARN SHOOTING AT THEM IS

BUT AUTHORITIES WARN SHOOTING AT THEM IS DANGEROUS AND UNLAWFUL

SHOOTING AT THEM IS DANGEROUS AND UNLAWFUL AND AT THIS POINT

DANGEROUS AND UNLAWFUL AND AT THIS POINT WHILE THE DRONES MAY

AND AT THIS POINT WHILE THE DRONES MAY BE MYSTERIOUS, THEY