The U.S. Postal Inspection Service published a statement on their website that \"these packages were originally set aside for further investigation because there were indications that they contained non-mailable matter.\"

Examples of \"non-mailable matter\" are: explosives, ammunition, alcoholic beverages, air bags and gasoline, according to the post office's website.

\"PHOTO:
Johannes Eisele/AFP via Getty Images
PHOTO: Nurses and healthcare workers attend a Black Lives Matter rally in front of Bellevue Hospital, June 4, 2020, in New York City.
>

\"Postal Inspectors proactively seek to identify [and remove] non-mailable material in the mail to protect the safety of postal employees, the U.S. Mail, and our communities,\" according to a statement to ABC News from the U.S. Postal Inspection Service's Office of Public Affairs.

\"PHOTO:
Daniel Leal-olivas/AFP via Getty Images
PHOTO: People attend a demonstration in Parliament Square in central London, on June 6, 2020, to show solidarity with the Black Lives Matter movement in the U.S. in the wake of the death of George Floyd in Minneapolis police custody.
>

The postal service did not explain what made these package subject to inspections. \"Specific investigative methods used by Inspectors are sensitive and must remain confidential, but they are effective in helping to locate non-mailable matter of all kinds,\" the postal service said.

However, once they were cleared by inspectors and deemed \"mailable, they were immediately placed back in the mail stream to be delivered at their intended destinations without further delay,\" the agency said.

The apparel company confirmed on Saturday that the first package was delivered to Minneapolis.

View this post on Instagram

We can confirm that the first packages have been delivered this morning. @mvmnt4blklives

A post shared by Movement-Ink (@themovementink) on Jun 6, 2020 at 8:25am PDT

\"PHOTO:
Angela Weiss/AFP via Getty Images
PHOTO: Protesters hold up signs on June 3, 2020, during a "Breonna Taylor and Black Lives Matter" protest in New York City, after the recent death in Minneapolis police custody of George Floyd.
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