Let's not let facts get in the way of a good story, right?
The generally accepted FACTS are the following.
In May 1967, following misinformation about Israeli intentions provided by the Soviet Union, Egypt expelled UN peacekeepers who had been stationed in the Sinai Peninsula since the Suez conflict, and announced a blockade of Israel's access to the Red Sea (international waters) via the Straits of Tiran, which Israel considered an act of war. Tension escalated, with both sides' armies mobilising.
Nasser knew that his blockade of the Straits of Tiran from Israeli vessel passage, on 23 May 1967, might very likely provide Israel with reason to launch war. His decisions to ask for the removal of the UN peacekeepers from Sinai and especially to block the Gulf of Aqaba to Israeli shipping via the Straits of Tiran, are commonly accepted as the point where war became inevitable.
If Wikipedia isn't factual enough (and we all know it isn't always factual) you can confirm the above via Encyclopedia Britannica, Columbia University and other non biased sites. Please spare me quotes from the anfi defamation league and other biased sources.