By CBSLA Staff

LONG BEACH (CBSLA) — Authorities on Sunday were investigating a theft of a city of Long Beach flag that was replaced by a flag in support of President Donald Trump.

The incident at a secured construction site for the Long Beach Police Department’s public safety building was discovered Sunday morning.

READ MORE: Evacuations Lifted As Crews Get Handle On University Fire In San Bernardino

It was there authorities say someone was able to gain access and replaced the flag with a flag that stated, “Trump” “Make America Great Again.”

READ MORE: LA Sheriff Alex Villanueva Blasts RAND Report On Deputy Gangs, Says Reforms Already In Place

The Long Beach Police Department released surveillance footage on Sunday of the incident, in which the suspect also attached a padlock to the pole to keep the flag in place.

The pro-Trump flag has since been removed as the incident remains under investigation.

MORE NEWS: Melvin Van Peebles, Iconic Actor, Writer & Director Dies At 89

In the meantime, officials said in a news release that the “LBPD is an apolitical organization that does not participate in any political activity that promotes one political party over another.”