Physically? Yes, and no.The six days was was started by Egypt. Learn history.
The Six Day War was started IN Egypt, when the IDF mounted what they called a "Premptive Strike" to destroy the Egyptian airforce on the ground.
How else than by surprise attack could Israel have been done so quickly?
The war started when Egypt close the Tiran.
Again, learn history.
A Hasbara lie.
The war started when Israel attacked Egypt on 5th June 1967.
The Israelis aren't known for doing things for no reason...
Why did the Jews attack the Egyptians?
On the eve of the war, Egypt massed approximately 100,000 of its 160,000 troops in the Sinai, including all of its seven divisions (four infantry, two armoured and one mechanized), four independent infantry brigades and four independent armoured brigades. No fewer than a third of them were veterans of Egypt's continuing intervention into the Yemen Civil War and another third were reservists. These forces had 950 tanks, 1,100 APCs, and more than 1,000 artillery pieces.[45]
[...]
Israel's first and most critical move was a surprise attack on the Egyptian Air Force. Initially, both Egypt and Israel announced that they had been attacked by the other country.
Six-Day War - Wikipedia the free encyclopedia
If the Israelis had taken the advice of the jihadis and racists among us and done nothing even as they saw Egypt's preparations to attack, we would be talking about the State of Israel in the past tense.
Because its likely they'd have been wiped off the map and pushed into the sea.
No such luck, you Muslim racists!
So we are agreed that Israel's attack initiated the war.
All you are arguing over is whether it was justified.
First act of war wasn't on the Israeli side, however that doesn't explain any of the prior hostility by any of these states nor the Palestinians but this is debatable.