I am not positive, but my guess would be that some nefarious character, wearing blue shorts either:
A) committed some type of crime
B) is wanted as a witness in some type of crime
D) was in the area where some type of crime may have occurred, and someone saw them and gave their description to the police.
E) did not exist and was just a fib told to the police to lead them off the track of the actual nefarious character
F) was just a rumour, and may not have been the reason the police were arround the hospital
G) or a false report was made, because someone needed real fast service at a local donut shop, and wanted the cops out of the way for a quick purchase.
Hope this information has been helpful.