WASHINGTON (AP) — The National Security Agency said Friday that some of its analysts knowingly and deliberately exceeded its surveillance authority on occasion over the past decade and that those involved were disciplined.

“Very rare instances of willful violations of NSA’s authorities have been found,” the agency said in a statement. It said none of the abuses involved violations of the Foreign Intelligence Surveillance Act or the USA Patriot Act. NSA violations of both laws have been highlighted in the leaks of classified information by former NSA systems analyst Edward Snowden.