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A Pomona man who allegedly took a loaded handgun to an elementary school and left it on an office counter was taken into custody after leading officers on a short foot pursuit on Monday, authorities said.

Police received a report of a person acting erratically at Alcott Elementary School (map) around 1:10 p.m., according to a news release from the Pomona Police Department.

When officers arrived at the scene, they began speaking with 34-year-old Isaas Valencia, who was standing outside with his two children after checking them out of the school early, the release stated.

Officers noted that Valencia “was acting erratically,” according to the release.

The students were walked back into the school by an officer, who was then told by a staff member that the man had left a loaded handgun wrapped in a shirt in the office, police said.

When officers attempted to take Valencia into custody, a struggle ensued and he fled on foot, allegedly taking live ammunition out of his pocket and throwing it to the ground as police pursued him, according to the release.

Valencia was later arrested and charged with “taking a loaded firearm onto a school campus and resisting arrest,” the release stated.

Officers were able to recover the handgun and ammunition.