The Third One

There has been a bank robbery in Southampton, and the detective identified that there were three major criminals.

The cops have caught 2 criminals and they won't reveal the third criminal .

So the police questions 3 suspects: Mr Johnson, Mr Harris and Mr Peter.

Each suspect makes a statement after they have been asked the question "Who is the robber ?"

Mr Johnson : I don't know him/her, but I guess it is Mr Luke.

Mr Harris : I was not here at that time, I was in an another city.

Mr Peter : I don't know them. It might be Mr Luke

Who is the third robber ?

HINT The third criminal is one of the three suspects !