Senator Ted Cruz’s Houston office was evacuated Tuesday after people were exposed to a mysterious white powder. 

The all-clear was given early Tuesday afternoon by the Houston Fire Department.

“All tests were negative for any hazardous substance,” the fire department said in announcing the all-clear.

An earlier statement from the HFD said, “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,” HFD said.

Ultimately, no injuries were reported.  The powder was inside mail that was sent to Senator Cruz’s office.  Houston Police said that the FBI was asked to help investigate.

Also on Tuesday, officials said two suspicious packages were found more than 1,000 miles away in the Pentagon mail screening facility. Officials believed the two packages at the Pentagon might have contained ricin, which is a deadly poison.