Never let it be said that the UFO phenomenon isn't worldwide. This could be a description of a contrail of a very high flying jet, but it seems to have been moving extremely slowly.
What is being described (and pictured) here is a persistent contrail, but the article doesn't say if anyone actually saw what caused it. One spectator was quoted, “It happened in seconds and it was there as if something zoomed in.", but again, he doesn't say if he saw the contrail being formed, or if it was after the fact. The article actually says very little at all, unfortunately.