They had codes set up with the authorities so they would know the calls were genuine.

...bomb threat in the U.S. ever led to a bomb being found or exploding?

It doesn't make sense to me to call it in.

to minimize injury or worse.

I remember being in London during those times. It was very matter-of-fact when they'd clear out a tube station or where-ever; people were very alert to "unattended packages" well before we became sensitized to that over here.

Centennial Olympic Park bombing....was called in

20 minutes prior to the Atlanta Olympics bombing. They also said that said that warning calls are sometimes made by someone close to the perpetrator who is aware of a plot and doesn't want anyone to get hurt.

And then you get to explain to dozens of families why you let their children die.

Some chances are not worth taking.

I hope you are not involved the schools my children go to.

of a bomb".

It seems neither were credible. I am not sure what is involved in determining credible vs not credible, but I'll leave that to those who know better.

Or like making a specious analogy in place of a valid response, my valued little friend.

You want to hand ISIS a way to disrupt shit, good for you.

NYC handled it great!

Well, good for you, too!

I basically agreed with you upthread.

Go find someone else to fuck with, I'm done here.

It seemed like once a month the police and FBI would be outside the office on Amsterdam Ave (?) opening our lunch bags and "frisking the sandwiches" and us. Naturally this made all of us late to work.

Based on the theory that no one actually intending to set off a bomb would send an advance warning of the act should any and all such threats be ignored? If not, which ones should be taken seriously and what should the authorities do in response to the threat?

And if you read posts in this thread, you will see several times when people gave advanced warning.

It was at a woman's health clinic and a bomb threat was called in for a device inside the building.

The place was evacuated and there was no bomb found, but there was a bomb strategically placed outside
the building (in a dumpster, I believe), meant to inflict causalities on first responders.

The tactic itself is/was a common one used by terrorists abroad.

They got them all the time around exams. They marched the kids outside. Police and Security searched the building and then issued an all clear. Students went back to classes. We did have Terror Drills 30 miles from Ground Zero after 9/11 but didn't tell the kids what kind of drills they were. Older kids KNEW what they were. Police Cars drove around the school during these drills.

When I worked in Florida schools we had Lockdown drills for shooter on campus. Two real ones. Went through the drill procedure, which didn't end after a few minutes. Principal called on radio that it was real. The little children got scared when they realized it was real. The other time with older kids they more or less took it in stride. Both affected the parents far more than the kids. I suppose if all the teachers were armed, class could have just continued? lol Florida tried that one recently after Sandy Hook which got a resounding NO from both Parents and Teachers.

It contained secret police files and evidence, which was the target of the bombing, so I don't know if that is properly called "terrorism" in that the intent was not to harm anyone, but a lot of people died.

Three warning calls were made before the attack. At 12:22 the first call was made, in both Hebrew and English, to a telephone operator on the hotel's switchboard. It was ignored.

At 12:27, the second warning call was made to the French Consulate adjacent to the hotel to the north-east. This second call was taken seriously, and staff went through the building opening windows and closing curtains to lessen the impact of the blast.

At 12:31 a third and final warning call to the Palestine Post newspaper was made. The telephone operator called the Palestine Police CID to report the message. She then called the hotel switchboard. The hotel operator reported the threat to one of the hotel managers, but they ignored it, again.

The bombs went off at 12:37.

Did anyone take responsibility? Was anyone caught?

Yes, a few times in fact. Most not in the United States though