Surprised something like this hasn't happened before, especially in a place like Las Vegas or L.A.

I remember after the 911 terrorist attacks in New York, Las Vegas casinos changed their security, when you self parked, they made you pop your trunk on your car.

Expect Las Vegas to change their security again.

You will see armed police/military/security everywhere.

You must pay for parking at almost all casinos on the Las Vegas strip now, but they will probably ask you to pop open your trunk anyway.

I think it's a good idea to stay away from big concert venues (in any city), especially if it's outside.