Locked Threads

I see some threads that are locked,
who did this the administrator(s) or the user?

I dont see an option to lock threads when I edit my posts, so I think it is the administrator,

but in the last post the original author posts, he is talking like he is the one who deleted it.

example

http://forums.vb-world.net/showthrea...threadid=26453


if users can lock threads..... how?
I cant seem to be able to find an option

Only the administrators can close the threads. It's a option at the bottom of this page at the right side. I mean the not the left.