Follow CBSDFW.COM: Facebook | Twitter

HOUSTON (AP) — Authorities are trying to determine what sickened three lab workers at the M.D. Anderson Cancer Center complex.

READ MORE: US Border Agents Receiving Help On Custody Work, Returning To Field

The incident happened Thursday morning at a two-story Houston research building that also houses University of Texas campus police.

Police spokesman Edward Cavazos says the building was evacuated for about 90 minutes after three workers reported feeling ill. Cavazos says none has life-threatening injuries.

READ MORE: US Ramps Up Plan To Expel Thousands Of Haitian Migrants Gathered In Texas

Cavazos says one person reported feeling overheated and in distress. He says two other lab workers then said they also felt uncomfortable.

He had no additional information on what caused the workers to become sick, but says the public was not in any danger.

Dozens of workers who evacuated the building, as a precaution, were allowed to return around 9:15 a.m.

MORE NEWS: Cecile Richards: Supreme Court's Inaction On Texas Abortion Law Could Mean End Of Roe

(©2016 CBS Local Media, a division of CBS Radio Inc. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)