About 30,000 people arrive to protest - 10 times the number anticipated by police.
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The U.S. is using both systems to take down Iranian missiles fired in retaliation for the American and Israeli attacks, but U.S. officials have said they are struggling to stop waves of drones launched by the Islamic Republic and that they are bringing in an American anti-drone systemproven to work against Russian drones in Ukraine. The system known as Merops also is cheaper than firing a missile that costs hundreds of thousands of dollars at a drone that costs less than $50,000.