Blockades and running blockades are acts of war. Some private Turkish citizens intended to run a blockade and got killed for their trouble. Both were acts of war. Before entering WWI, the USS Lusitania attempted to run the blockade of the UK by Germany and got sunk for its trouble. That was the straw that broke the camel's back; the US entered the war on the UK side. Killing people using military force is an act of war. Before this turns into a Jutland-like confrontation, maybe some cooler heads will prevail. Maybe China with their new carrier can talk sanity to both sides. They don't have a dog in this hunt.
from the article: Report: Turkey navy to escort aid ships to Palestinians in Gaza