CHICAGO -- Chicato Transit Authority service to the Clark/Lake station at the Thompson Center downtown was back Monday afternoon, after a burst pipe at an entrance to the station caused the agency to shut it down temporarily.

A sprinkler head at the street level Lake Street entrance of the Thompson Center, which is also the entrance to the CTA Blue Line station at Clark and Lake burst around noon Monday and "it flowed for quite a while," Fire Media Affairs Director Larry Langford said. Water from the pipe collected on the floor and the level below, Langford said.

The break occurred at 117 W. Lake St., on the south side of the street, police News Affairs Officer Marcel Bright said. Water ran down the stairs into the Blue Line subway station, he said.

The station's entrance and exit were closed while the water was cleared from the area.

CTA Blue Line trains stop in the level beneath the leak and elevated trains stop at the station outside the building.

The CTA was asked to close the entrance and exits to the stations at the Thompson Center, CTA spokeswoman Wanda Taylor said. Blue Line trains were not stopping at the station for almost two hours Monday afternoon. Blue Line trains were back in service at the station as of about 2 p.m., though elevated train riders need to use the LaSalle Street entrance/exit, Taylor said.

The water collected there was not very deep, Langford said, but it was deep enough to have to be squeegeed.

There were no reported injuries from the incident, both Langford and Bright said.

The incident is weather-related, Langford said. "The temperatures near that doorway got cold enough to freeze that pipe." He said that same sprinkler head also broke last winter.