B737-500 first officer reported ATC directed abort at den because of amass alert.

Attributes
ACN	626604
Time
Date	200408
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : den.airport
State Reference	CO
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-500
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	ground : takeoff roll
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Experience	flight time last 90 days : 210 flight time total : 6900 flight time type : 3500
ASRS Report	626604
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	faa : investigated other other other
Supplementary
Problem Areas	FAA Navigational Facility
Primary Problem	Navigational Facility
Situations
ATC Facility	procedure or policy : dec.tower

Narrative:

We were on takeoff roll at about 120 KIAS when the tower told us to abort the takeoff. Weight approximately 111000 pounds. The captain aborted the takeoff and rejected takeoff braking engaged. We taxied clear. Ramp service chocked the wheels and then maintenance inspected the gear and said 2 tires had blown. They replaced one and we then taxied to a gate. The captain talked with tower controller and he said that their ground radar had alerted them to a vehicle on the runway, but then showed hundreds of vehicles, so was obviously in error. No injuries reported among crew or passenger. We were given a different airplane and flight attendants (they had timed out in the meantime) and continued onto lax.

Original NASA ASRS Text

Title: B737-500 FO RPTED ATC DIRECTED ABORT AT DEN BECAUSE OF AMASS ALERT.

Narrative: WE WERE ON TKOF ROLL AT ABOUT 120 KIAS WHEN THE TWR TOLD US TO ABORT THE TKOF. WT APPROX 111000 LBS. THE CAPT ABORTED THE TKOF AND RTO BRAKING ENGAGED. WE TAXIED CLR. RAMP SVC CHOCKED THE WHEELS AND THEN MAINT INSPECTED THE GEAR AND SAID 2 TIRES HAD BLOWN. THEY REPLACED ONE AND WE THEN TAXIED TO A GATE. THE CAPT TALKED WITH TWR CTLR AND HE SAID THAT THEIR GND RADAR HAD ALERTED THEM TO A VEHICLE ON THE RWY, BUT THEN SHOWED HUNDREDS OF VEHICLES, SO WAS OBVIOUSLY IN ERROR. NO INJURIES RPTED AMONG CREW OR PAX. WE WERE GIVEN A DIFFERENT AIRPLANE AND FLT ATTENDANTS (THEY HAD TIMED OUT IN THE MEANTIME) AND CONTINUED ONTO LAX.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.