Conversation so far:
Are there any other interesting aspects about this article?
The Palestinian Authority declared three days of mourning and closed Palestinian schools.
What caused this closure?
"This is the moment Sheikh Yassin dreamed about.
Who were they mourning?
Yassin.
When did he die?
CANNOTANSWER.
Why was this the moment he had been waiting for?
CANNOTANSWER.

Question: Tell me more about his dealings with Palenstein?
Self-contained rewrite: Tell me more about Ahmed Yassin's dealings with Palenstein?