11.   Then Gregor, a volunteer firefighter, heard an alarm.

12.   Those in the commandos have radios at home and in their cars, so they can hear the alarm no matter where they are on their properties.

13.   When I heard the first alarm, I thought this could be a terrorist thing.

14.   A morning alarm was heard, but the all-clear sounded a few hours later with no report of strikes in or near the capital.

15.   Before the drills started, the participants had been asked to sign up and told what to do upon hearing the alarm.

16.   But a morning alarm was heard and when the all-clear sounded a few hours later, Yugoslav media reported Batajnica airfield, near Belgrade, hit.

17.   But a morning alarm was heard, and when the all-clear sounded a few hours later, Yugoslav media reported Batajnica airfield, near Belgrade, hit.

18.   But a morning alarm was heard and when the all-clear sounded a few hours later, Yugoslav media reported Batajnica airfield, near Belgrade, was hit.

19.   Fire officials said the building had regular safety checks and was equipped with smoke detectors, but some of the survivors told police they had not heard any alarms.

20.   However, the Safety Board previously reported that alarms were heard on the cockpit voice recorder tape, which also was reviewed.