The Lexington Fire Department responded to a water flow alarm in the W. T. Young Library at about 8:50 p.m. Thursday.

A water flow alarm, which can signal that water is flowing in the sprinkler pipes, could have been activated by a change in water pressure, said Major Matt Galati of the Lexington Fire Department.

It’s a fairly common event, he added.

When the fire department left after 20 or 25 minutes, UK’s physical plant division was still investigating the water flow system, which was still activating the alarm for some reason, Galati said.