You seem confused about what has happened.
Israel has been committing a genocide in Gaza for some time. Conservative figures suggest they have killed at least 70,000 people. They have flattened Gaza.
Israel and the US have recently started an illegal war on Iran (28th Feb) on a whole range of pretexts (all illegal).
Iran warned that it would respond if they were attacked again (the US attacked them in June 2025 and then told the world that they had eliminated Iran's nuc weapons capability, etc)
Israel and Iran chose to ignore the warning.
Israel and Iran have attacked heavily populated, civilian areas in Iran, Lebanon and other countries. They have also attacked several hospitals, a desalination plant and a school, killing 160+ children. There have been thousands of Iranian casualties.
Iran have defended themsevles and attacked military assets in various countries. There have been some Israeli casualities (far less than the Iranian casualties). Btw, they warned that they would hit Dimona, if this is what you are referring to.
War is a terrible thing all round. The Israelis started this awful war.
The implications of this war and going to be felt worldwide and have already been felt in lots of countries.