Quite a lot of shooting attacks since the start of 2023, for one. If you want go back further, there was involvement in the intifadas.

> Two decades on, Israel has sounded alarms over the growing number of gunmen in Jenin and their stockpiling of munitions. Israel says the camp is a hub for planning and preparing militant attacks as well as a safe haven for fighters funded by Hamas or the Iranian-backed Islamic Jihad group.

> Israel also says more than 50 shooting attacks have been carried out by Jenin-area militants since the beginning of 2023 and that almost half the population is affiliated either with Hamas or Islamic Jihad.

https://www.reuters.com/world/middle-east/why-is-israel-atta...