Israel and Iran have begun a new round of attacks, as the conflict between the two heavily armed rivals enters its fourth day.

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 a conflict between the regional foes that showed no sign of slowing.

Iran launched a wave of missiles just hours after Israel said it was striking missile sites in central Iran. Israel says it hit Quds Force command centers.