The issue focused on the study of security issues.

"It is not a question of access to information, it is a question of how we will use that information in our national interest and for the betterment of all," he said.

In his address, Mr O'Brien also paid tribute to those who have lost their lives in recent years, including police officers and members of the public.

He said: "We are still trying to come to terms with the loss of so many people