New Yorkers participate in air-raid drill in 1951

At 10:33 AM, air raid sirens signaled a potential attack on New York City, prompting 354,000 volunteers and 30,000 police and firemen, along with US Air Force units, to mobilize in response to the perceived threat of enemy bombers or missiles.

What time did the air raid sirens start wailing?

How long did the air raid alert last?

Which city was under threat from enemy bombers or missiles?

What was the response of civil defense workers during the alert?

Who were the key participants in the emergency response?