The theft of three guns, four badges, jewelry and cash occurred during the first half of the game between LAPD's Los Angeles Centurions and the San Diego Enforcers police team at Bishop Mora Salesian High School's pitch in Boyle Heights, Calif., reported KTLA.
It was discovered at half time, at around 5:30 p.m., and caused a 20 minute delay in the players returning to the field.
LAPD Sgt. Gabriel Lara said the items were only taken from the San Diego team's locker room, which showed no signs of forced entry.
No items were stolen from the LAPD room.
"But it's pretty brazen to break in to a facility during daytime hours with numerous people in the campus," Lara added.
Not to mention a stadium filled with law enforcement personnel.