New Delhi, March 2 -- Some of the jubilation was open and even raucous - people dancing in Iranian streets, honking car horns in celebration, screaming joyfully from windows and rooftops over the killing of the country's supreme leader. But as bombardment by the United States and Israel fell from the air for a second day Sunday, many expressed fear and uncertainty over what direction Iran will take.

The death of Ayatollah Ali Khamenei, who stood at the pinnacle of Iran's Islamic Republic for nearly four decades, along with a number of top military leaders in the first day of the U.S.-Israeli campaign, stunned Iranians and stirred a mix of complex emotions in a divided nation.

"Inside, we are in party mode," said one man in northern Tehr...