India, Jan. 11 -- Hours after US President Donald Trump dropped a major hint about his plan for Iran as authorities there confront the biggest anti-government protests in years, Israel reportedly remained on high alert for the possibility of any American intervention in the chaos.

According to news agency Reuters, which quoted three people who attended Israeli security meetings over the weekend, Israel is preparing for possible action by the United States in Iran, where violent protests have led to the deaths of more than 100 people.

During a phone conversation on Saturday, Israeli Prime Minister Benjamin Netanyahu and US secretary of state Marco Rubio spoke about the possibility of American intervention in Iran, the source told the new...