HOUSTON -

A suspicious envelope with a white powdery substance was delivered to an east Houston elementary school Friday.

Officials said the envelope was mailed to Franklin Elementary School, 7101 Canal Street in the Houston Independent School District, and arrived at the campus around noon.

HFD hazmat officials went to the scene and did not find anything alarming about it after initial testing. The school was not evacuated. The area where the envelope was received was quarantined until the all-clear was given.

Officials said additional testing will be done on the substance.

School authorities said no students came into contact with the substance.

Principal Jilliane Raphiel sent the following letter home to parents to alert them of the incident.

"I am writing to inform you of an incident that occurred on our campus today, Friday, December 21, 2012.  A letter containing a white powdery substance arrived on campus through the U.S. mail.  Testing on the envelope and the powdery substance revealed that the substance DID NOT pose a threat to our students or staff.  No students are believed to have come into contact with the substance. 

"When the letter was opened, campus staff immediately notified law enforcement and a Houston Fire Department hazardous materials crew was dispatched to our school.  The main office was temporarily quarantined and the air conditioning system was turned off.  Instruction returned to normal after officials removed the letter from campus.

"The Houston Independent School District considers student and employee safety to be our top priority.  Please do not hesitate to contact the school if you have any questions or concerns. Thank you."