Police have arrested a 59-year-old man in connection to a bullet which was posted to Tobermore Primary School ealier this year.
Following searches in the Tobermore area on Thursday (June 12) police made the arrest and seized cash and ammunition.
In March this year a bullet was posted to the school in a letter along with a sympathy card.
A PSNI spokesperson said the investigation centred on an intimidating letter reported to police on March 3.
Police said they are treating the incident as a hate crime.