What happens with the property tax owed on a sheriff sale in Philadelphia

[Rafael Floresta]

I am trying to figure out if I need to pay the property tax that is owed by the previous owner when I buy a mortgage foreclosure in Philadelphia. 

The current owners owe about 6k in property tax, so not the end of the world, but it that could make or break my bid being the best one out there. 

I tried to read as much as possible, but I can't find an answer for it. If you know the answer, and if you can get a link or a source, it would be great too.