At least 20 Palestinians were killed in Israeli strikes on the Gaza Strip overnight and into Saturday, according to local health officials. The 20-month war with Hamas has raged on even as Israel has opened a new front with heavy strikes on Iran that sparked retaliatory drone and missile attacks.

Years of intelligence collection, infiltration of Iran with commandos and weapons, and tracking of targeted commanders and scientists made the wide-ranging attacks possible.

Israel has gutted Iran's nuclear and military leadership with airstrikes that leave a weakened Tehran with few options to retaliate, including an all-out war that it is neither equipped for nor likely to win,