The strikes were spread across 20 provinces, according to the Washington-based monitoring group Human Rights Activists News Agency, and represented the highest rate of attacks recorded in the past 10 days.
Among those killed were four children and two women, HRANA said, adding that the figures remain preliminary and could rise as more information emerges.
In total, the group documented at least 573 individual strikes across 215 separate incidents during the past day, a scale of bombardment that analysts say reflects a widening focus on strategic sectors of Iran’s economy.
Many of the attacks targeted infrastructure linked to the country’s core industries, including elements of Iran’s energy sector, HRANA reported.
The latest wave of strikes comes as President Trump has warned that the United States could launch sweeping new attacks on Iranian infrastructure if Tehran does not agree to negotiations by Tuesday evening.
In a statement Monday, the White House said Iran would be “sent back to the stone ages tomorrow night if they fail to engage in a serious way” with diplomatic efforts.
The war, now in its sixth week, has already inflicted heavy losses across the region.
Iranian authorities and monitoring groups estimate that more than 2,000 people have been killed inside Iran since the conflict began. Israeli officials say at least 26 people have been killed there, while missile and drone attacks launched by Iran have also caused dozens of casualties in the Persian Gulf countries.
With negotiations uncertain and attacks intensifying on both sides, Tuesday is shaping up as one of the most consequential moments in the conflict since it began more than five weeks ago.
