I don’t know what happened to the S that supposed to be on the Yahoo! front page. Maybe it slipped out when no one was looking. If someone had seen it, I wonder what the witness’s claim would be:
I bet the writer thinks that’s correct: That you form the possessive of a singular, common noun ending in S by adding just an apostrophe. A lot of authorities, including the Associated Press and the Chicago Manual of Style, would disagree. They say that the plural of a singular, common noun ending in S requires an apostrophe and an S. The only exception AP makes is when the possessive is followed by a word that starts with S, because the would be just too many S’s (so, it’s witness’s claim, but witness’ story).