Conversation so far:
what was Ahmed Yassin's involvement in the attacks?
Yassin was a founder and prominent leader of Hamas, which is regarded as a terrorist organization by a number of national governments.
what did he do as leader?
characterized Yassin as the "mastermind of Palestinian terror" and a "mass murderer." The.

Question: what else was said?
Self-contained rewrite: Besides for being characterized as a mass murderer, what else was said about Ahmed Yassin?