Tehran residents tell Newsweek the city is filled with fear and uncertainty, as old memories of past conflicts resurface alongside quiet defiance.

Iran and Israel intensified strikes on each other's infrastructure and territory over the weekend after Israel launched a surprise assault on its long-time enemy's military leadership and nuclear program.

Iran fired a new wave of missile attacks on Israel early Monday, triggering air raid sirens across the country as emergency services reported at least five killed and dozens more wounded in the fourth day of open warfare between the regional foes that showed no sign of slowing.

Nineteen Israelis have been reported killed in Iranian attacks since Friday, while Iran’s health ministry says 224 have died in Israeli strikes.

The retaliatory strikes came on Saturday, a day after Israel killed top Iranian military leaders and scientists and destroyed an aboveground nuclear enrichment plant near Natanz.

Good morning. Israel and Iran intensify their attacks on each other. Donald Trump orders ICE to expand deportations. And concert ticket prices are falling for the first time in years. Listen to the day’s top stories.

Iran fired a new wave of missile attacks on Israel early Monday, triggering air raid sirens across the country as emergency services reported at least five killed and dozens more wounded in the fourth day of open warfare between the regional foes that showed no sign of slowing.

The fighting, which began on Friday with a surprise Israeli attack on Iran, has been some of the fiercest and most prolonged in the decades-long enmity between Israel and Iran, raising fears of a wider war that could draw in the United States and other powers.

That came as fresh attacks targeted Iran's energy infrastructure, including fuel supplies and a top natural gas field.