A stash of petrol and paint bombs have been seized by police in Co Armagh.
Baseball bats and potential missiles including golf balls were also found in a wheelie bin close to a sectarian flashpoint in Garvaghy Road, Portadown.
PSNI area commander Chief Inspector Anthony McNally said it was clear some elements were preparing for disorder.
He said: "Whilst I welcome the removal of these items, I must also stress my concern that they were there to begin with.
"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."
The discovery was made on Tuesday night after a PSNI patrol noticed a group of youths trying to lift a bin into the grounds of a park.
Mr McNally has appealed to parents and community representatives to use their influence to keep peace on the streets during the marching season. The items have been taken away for forensic examination.
Meanwhile, on Wednesday night a number of petrol bombs were removed from an east Belfast interface where there have been tit-for-tat attacks between nationalist and loyalist communities over the past week.
Sinn Fein councillor Niall O'Donnghaile said: "While a find of this nature will no doubt give many cause for concern, I welcome the fact that they have been taken off the streets.
"I would again call on everyone to show their support for residents living at the interfaces and call on those determined to cause trouble to heed their calls and stay away."