NASHVILLE (AP) — A colony of bees on the roof of Nashville's new convention center didn't survive the winter.

WPLN-FM reports (http://bit.ly/1PXmnmw) that officials don't know what killed the 100,000 honeybees that had been brought to the Music City Center last summer.

Music City Center spokeswoman Mary Brette Clippard says disease and pests were ruled out as the cause in an investigation by the Nashville Area Beekeepers Association. She says there might not have been enough time for the bees to amass the numbers they needed to survive the winter.

The bees began disappearing around the first freeze. But Clippard says the bees left behind hives that are in "wonderful shape," and that the convention center plans to acquire four new queen bees to get the colony re-started early this summer.