HELP!! Unwanted individuals moved into my vacant property

[Derrick Jordan]

Need assistance and advice on getting trespassing unwanted individuals out of my vacant property.  Previous tenants moved out several weeks ago. Property was locked and secured.  While cutting grass the other day my landscaper alerted me that someone was in the property and he was told by the individuals that they purchased the property via tax sales.  (Property Taxes were never sold) Returned to the property today with police officers and the locks were changed.  No answer. According to the Police Officers there is nothing they can do and I will have to take the matter up in court.  

What can be done?

Thanks