Police have confirmed four explosives recovered from Derry City Cemetery Cemetery in Creggan were viable pipe bombs.
It follows trouble in the city over the Easter period, with police coming under attack by youths throwing petrol bombs on Monday.
Derry City & Strabane Area Commander Chief Superintendent Nigel Goddard said: "These actions have seen the exploitation of young people in the illegal parade, with a complete disregard for public safety. We believe these would have been used to attack police, and cause injury to our officers.
Read more: Derry cemetery security alert: Police say four pipe bombs found
"Our colleagues from Terrorism Investigation Unit are continuing with their enquiries into this. At this time, the main line of enquiry is these pipe bombs are attributable to the New IRA.
"We urge anyone with information that may assist the investigation to call police or contact Crimestoppers, which can be done anonymously."
On Monday, a crowd of people were observed forming a tight-knit group and blocking the view of those present with umbrellas before what appeared to be clothes were set on fire inside the cemetery grounds.
The cemetery had been closed on Tuesday morning while officers examined the devices, which were left following the parade.
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