Not much difference for me.
Student or Learner
The following context is from CNN website:
"It has been nine days since a wave of ISIS attacks in Paris killed 130 people. French authorities have said the Paris attacks were organized in Belgium."
How differently will native speakers interpret the context if it becomes "........French authorities said......" ?
For me, the present perfect leaves open the possibility that this statement might not be the final one on the issue.
Joseph, please note that a better title would have been French authorities said/have said.
Extract from the Posting Guidelines:
'Thread titles should include all or part of the word/phrase being discussed.'
OK, I see.