Winfield ? Two students are accused of putting staples in ketchup at the Winfield high school and middle schools – an incident that has school officials reviewing their kitchen-access policy.

Officials were alerted after two students eating lunch found the staples in their food Wednesday. Food service workers found more staples in the bottom of ketchup bins being used in the lunch lines. They quickly removed hamburgers from the menu and called police.

After investigating, police learned the staples were placed in the ketchup last week. They said no further arrests are expected.

School officials said they will look at changing their policy for allowing people in the kitchen.

The students arrested could be suspended for a short term or be expelled, Superintendent Marvin Estes said. A hearing to decide their punishment has not been held.