This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated.

HOUSTON (AP) – A spokeswoman for Republican Sen. Ted Cruz says a package addressed to Cruz’s Houston campaign headquarters caused a lockdown. Authorities later lifted an evacuation order after saying two people were apparently exposed to a “white powdery substance.”

The Houston Fire Department tweeted Tuesday that tests for hazardous substances were negative after the building floor where Cruz’s office is located was evacuated.

Cruz spokeswoman Catherine Frazier says no one from the campaign staff was taken to the hospital.

Frazier said the package was opened in the lobby. She said authorities locked down the lobby and elevator for a couple hours.

It comes on the same day that authorities at the Pentagon say they found at least two packages believed to contain ricin, a deadlywhite powdery poison made from castor beans.

Two people were taken to the hospital after apparently being exposed to a white powdery substance in an office building at 3200 SW Fwy. The 9th floor of the Phoenix Tower has been evacuated as HFD HazMat is responding to the scene working to determine the nature of the substance. — Houston Fire Dept (@HoustonFire) October 2, 2018