U.S. officials have been told Israel is fully ready to launch an operation into Iran, multiple sources told CBS News.

"This confrontation will not end with last night's limited actions and Iran's strikes will continue, and this action will be very painful and regrettable for the aggressors," Fars reported, citing senior military officials.

Explosions could be heard in Tel Aviv on Friday night local time, as sirens rang out across Israel amid what the Israeli military said was an Iranian missile attack.