What do I do about "squatters in my house?

I co-signed for 2 people and they moved out. They turned in their keys and I turned in mine. One of the 2 people let these other people move in right before they left and now the landlord wants me to get these “squatters” out, but says he does not want me to put myself in harms way to do it. I consulted with an attorney yesterday and he said he did not know how to advise me and gave me the phone number to another attorney. I called that attorney and she told me that she does not give advise over the phone. So I still need some advise!