HazMat crews called to Ted Cruz's headquarters at Greenway Plaza

HOUSTON (KTRK) -- HazMat crews have been called to investigate a white substance that was found at Ted Cruz's headquarters here in Houston. The substance was tested and found to be soap.

Cruz's spokesperson Catherine Frazier issued the following statement: "Today, a staff member in our Houston office opened a letter that contained a white substance. The office followed standard protocol, immediately notifying local authorities. The FBI, their HazMat team, and City of Houston Fire Department came to the scene and tested the substance. It was found to be non-toxic, and has been taken away by the FBI for further testing."

Several offices, including the Israeli consulate, are inside the building, but a Houston Fire Department official confirmed with abc13 that they responded specifically to Cruz's office. A campaign spokesperson tells abc13 that everything is fine and it's business as usual.

Cruz was not at the building. He's in Florida preparing for the latest GOP debate, which is happening tonight in Miami.