I very much doubt it. This is the first time their name has cropped up in the Gaza. Hamas would not tolerate them in the Gaza and there is only one way this so-called 'Ansar al-Sunna' mob could have got hold of a Qassam rocket - and that's from the Israelis! Think about it. You say niether Hamas nor Israel want another war. Wrong. Israel is itching to find a way to get a war going that will bring on the Final Confrontation with Iran, Hamas and Hezbollah.
Dozens protest in Shfaram against budget cuts targeting Christian schools (Haaretz)
from the article: Neither Israel nor Hamas wants another Gaza war