Usually, Gaza terror groups fire a mix of Qassam missiles and some mortar shells. This time, all fire was mortars. The change is not related to Purim, obviously. Recall that the Iranian shipment to Gaza, outside the anti-sea missiles and their equipment, as well as bullets for AK-47, included many shells for medium and long range mortars. This is the type of shells being fired now. It seems that the message to Israel is: You can stop us sometimes, but we already have plenty of the stuff.
U.S. says it killed 10 AQAP Islamist militants in four air strikes in Yemen since April 23 (Reuters)
from the article: IDF kills two Palestinian terrorists near Gaza border