DALLAS (CBSDFW.COM) – Five envelopes containing white powder were found at Dallas-area locations Monday.
Four of the envelopes were found at schools. The fifth was found at the Texas Instruments plant in North Dallas.READ MORE: Health Officials Urge Safety Measures Against West Nile Virus In North Texas
Hazardous materials teams determined the white powder in the envelopes sent to the schools was cornstarch.READ MORE: 350-Pound Man Wanted In Dallas For Alleged 'Lewd Sex Act With Children Present' In Restaurant
Crews have not yet identified the powder in the envelope at Texas Instruments.
Postal inspectors and the FBI are investigating each case, an FBI spokesman said.MORE NEWS: Elementary School Placed On Lockdown After Police Chase Suspect Hides Near Campus
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