The Israeli military hasn’t officially announced a new operation in Northern Gaza as of the most recent sources I possess. However, the situation can change rapidly, so I would advise you to check the latest news from a reliable source.
Historically, the Israeli military has been very active in response to threats from Hamas, and there have been numerous operations in Gaza over the years. For example, in 2014, the Israeli military launched Operation Protective Edge in response to increased rocket attacks from Gaza.
Hamas is considered a terrorist organization by several countries, including Israel and the United States, but it is also the de facto governing authority of the Gaza Strip, so any significant military action from Israel can lead to a major escalation of hostilities.
The Israeli military typically cites self-defense as the reason for these operations, while critics argue that the Israeli response is disproportionate and leads to a high civilian death toll. The ongoing conflict between Israel and Hamas is a complex issue with deep historical and political roots.