A hard-line Iranian newspaper called for retaliation against Israel, a day after the mysterious car bomb that killed a nuclear scientist in Tehran. Provocative hints from Israel reinforced the perception that the killing was part of an organized and clandestine campaign to set back Iran's nuclear ambitions, which the U.S. and its allies suspect are aimed at producing weapons. Iran says the program is for peaceful purposes only. The day before the attack, Israeli military chief Lt. Gen. Benny Gantz was quoted as telling a parliamentary panel that 2012 would be a "critical year" for Iran.