Gunna go with probably not legit charges seeing as how they arrested about 10,000 civilian Palestinians. Notably they were in their own country so it is by definition hostage taking given the laws of Israel so not apply in Palestine and they have no extradition agreement in fact they have the exact opposite.

If someone from the US was taken from the US and put in prison in Israel for a crime in Israel without permission to extradite the other country would be accused of unlawful imprisonment and unlawful extradition. Would anyone like to guess the charge that a country taking a hostage would be accused of?