The consensus was that some child in the other ward must have pulled it and was quite pleased with himself. After all the fire alarms say "Pull Me." We figured his parents would be in the first car out of the parking lot. Since our ward still had two and half hours to go we remained while the other ward went home.
The alarm warranted one fire truck, one ambulance, and several firefighters loaded for bear. After about fifteen minutes we were allowed back in. The bishop explained that the alarm had been triggered in the ceiling probably due to a malfunction.
The brother giving the talk before we left, took to the podium to finish. He was barely two sentences in when the alarm went off again complete with flashing lights. He stood for a moment before it was turned off.
Beginning again he said, "As I was saying..." Bam the alarm went off again. This time he sat down and we begin to wonder if this was the Lord's way of keeping him from declaring false doctrine. After a few minutes he tried again, "As I was saying..." Bam the alarm stopped him. This time a member of the bishropric stood up, handed this man his notes and scriptures, and had him sit down.
No further attempt was made. The bishop excused us to go home since the alarm refused to be silent. We will never know what that brother was to declare.