From the Times of Israel (yesterday):
Gaza terrorists fire rocket at Israel, but it falls short and lands inside Strip
Gaza terrorists attempted to fire a rocket at Israel on Sunday.
The Kassam missile landed in an open area in the Gaza Strip, causing no injuries or damage, the IDF Spokesman’s Office said.
The rocket fire is a breach of the Egyptian-mediated ceasefire signed by Hamas on November 21 ending Israel’s Operation Pillar of Defense. As part of the deal, Hamas agreed to halt its own fire and rein in other terror groups.
Also on Sunday, IDF soldiers arrested two unarmed Palestinians who crossed the Gaza border fence.
As others have pointed out, so far there have been no rockets of mortars that landed in Israel in December; the first month in years that this has been the case. It appears somebody in Gaza is unhappy about that… For more, see Challah Hu Akbar (as mentioned by the Elder of Ziyon.).