The police are at the scene of a security alert in the incompe in northern Belfast.
Tickets to Cave Hill Country Park and Belfast Castle in the Anthrim Road have closed.
The public has the leg that is asked to avoid the area at this time.
Residents said they have heard a series of controlled explosions from Cave Hill, starting at 08:00 BST.
A resident, who lives in DownView Park West, near Country Park, said the police patrolled the doors from approximately 21:20 BST Tuesday night.
The man said that a cord was installed at the near entrance of the park from early on Wednesday morning while he was going to walk his dogs.
Near, some tourists were disappointed not to visit the castle.
Doug Hayward, by Fort Worth, Texas, had traveled to Belfast Castle with his wife on Wednesday morning after his flight to Edinburgh was canceled.
“We were stuck at the airport this morning, so we return to Belfast for the day to look around,” he touched the BBC News or.
“We thought we would come to the castle, but it is closed, so I guess we will return to the city center.”
