ST. PETERSBURG, Fla. -- The St. Petersburg Police Department is out in St. Pete digging up an area off 71st Street. 

But what they are digging up, we don't know. The police department has remained tight-lipped about the investigation, only saying that they are acting on a tip. 

A lot off 71st Street North in St. Peter has been blocked off as a crime scene by law enforcement. 

Officers began digging up the area Tuesday afternoon. Pumps are out draining water out of a pond and K9s have been brought out to help with the search. 

Spectrum Bay News 9 has asked officials if this has anything to do with a cold case, but they won't confirm anything, just that they are working off a tip.