Officials confirmed that there is no threat to the public.
School officials at St. Laurence Church said no students were harmed, but parents were welcome to pick up their children early.
SkyEye flew over the school on the 3100 block of Sweetwater Boulevard, where lines of cars were seen along the campus. Parents were also standing in line, waiting for their students.
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Officials did not elaborate on the package's appearance or where it was located.
The school also said that after-school activities for the day, including the band concert, would be canceled.
Sugar Land PD said that extra officers were added on campus out of an abundance of caution for additional safety.
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This is an ongoing investigation.