Two men were arrested Saturday after they were seen climbing Vista Tower in the Loop.

About 7:10 p.m. officers responded to reports of two people climbing the building at 363 E. Wacker Dr., which is still under construction, Chicago police said.

Vista Tower, designed by Chicago architect Jeanne Gang, will be the third largest building in the city when it is completed in 2020.

When the pair, both 28, returned to the ground, they were placed under arrest, police said.

Charges were pending.

Video shows two men climbing the elevator shaft of the Vista Tower construction site in Chicago's Loop. The high-rise will be 1,198 feet tall when complete. https://t.co/Eg7Pj5hMtL — John Sheehan (@dogstar7tweets) June 9, 2019

A firefighter was injured in January while responding to a fire in the building’s basement.