Three wheelie bins containing paint bombs and other weapons including a baseball bat have been uncovered by police.
Police discovered the cache after noticing a gang of youths acting suspiciously in the Garvaghy Road area of Portadown on Tuesday night.
The youths - who had been attempting to lift a wheelie bin into the grounds of the park - made off when police arrived.
The bin, along with two others located nearby, were found to contain a large number of paint bombs, bottles with rags in the necks, golf balls, tins of paint and other items.
They were seized and taken away for further examination.
Police Chief Inspector Anthony McNally said he was concerned about such a find heading into "the busy summer months"
"Whilst I welcome the removal of these items, I must also stress my concern that they were there to begin with," he said.
"Police along with our partners in the local community have been working hard to ease tensions in the area, particularly in the run up to the busy summer months, though it would seem that some elements are determined to prepare for, and to cause trouble.
"I believe this to be a very small minority and call upon parents, community representatives or anyone with influence in the community to send a message to those intent on violence that it is not welcome on our streets, and hinders the positive image of Portadown the vast majority of us wish to see."