just look up http://en.wikipedia.org/wiki/Katyusha It does not look like a Qassam whihc is home made pipe filled with rude explosives. Katyusha rockets are industrially manufactured by Russia, China and Iran.
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Obama: Paris summit shows nations’ shared sense of responsibility to tackle climate change (Reuters)
from the article: IDF says Hamas responsible for Katyusha fired from Gaza Strip