Why the author use ”relating” instead of ”related”?

Question

"People from all backgrounds need to be empowered to discuss matters relating to terrorism and preventing violent extremism on their own terms," Mr Nawaz concluded.

source: last paragraph in
http://uk.news.yahoo.com/politics/20080807/tpl-nine-in-ten-young-people-want-to-add-81c5b50.html

Answer 1

There is no difference between "relating" or "related" in the sentence. Both can be used and both are correct in grammar.