Many years ago, all the employees in Education City, Doha, received an SMS message, warning them to stay inside the buildings as there was a tiger on the loose on the campus.
Some hours later, the all-clear was given.
Some further hours later, another SMS came, apologising for the fact that the original SMS was delayed by ONE DAY because the local telco assumed that it was spam, given the sheer volume of identical messages that arrived at the one time.
So yes, there was a tiger on the loose on the campus for a full day and no one knew!