UPDATE x 2: WWE.com has now picked up the story. They note that the fan has been arrested and is currently in jail.

Here is the WWE.com report:

WWE.com has learned that Randy Orton was violently attacked by an audience member during a SmackDown World Tour Live Event in Cape Town, South Africa, this evening. Footage of the attack was captured by a WWE fan and posted to YouTube, and shows the perpetrator striking Orton from behind. The matter is currently under investigation by the local authorities, and the South African fan is being held in jail pending criminal charges. The extent of Orton's injuries are unknown at this time.

UPDATE: TMZ reports that the fan in question hit Orton with a low blow, which is what caused him to fall down.

A rep for the WWE said, "Randy was violently attacked from behind" by the fan, who is now in police custody. Orton was checked out by doctors to make sure he's okay.

Here is the full TMZ.com article:

A crazed WWE fan has been arrested after climbing into the ring during an event in South Africa today ... and blasting Randy Orton in the nuts, TMZ has learned.

The video is pretty wild -- the fan jumps into the ring and sneaks up behind Randy while the wrestler is on the turnbuckle ... and swings his arm up between Randy's legs. Security immediately jumps in and drags the fan away, but not before Randy attempts to kick the guy.

A rep for the WWE tells TMZ, "Randy was violently attacked from behind" by the fan -- who was not part of the show ... and is now in police custody.

The extent of Randy's injuries is unclear -- we're told docs are checking him out -- but any shot to the jewels is serious in our book.

ORIGINAL: There was a scary moment at today's WWE live event in Cape Town, South Africa, as Randy Orton was attacked by a fan following his match against Big E Langston, according to multiple eye-witnesses via Twitter, and PWInsider.com.

"Fan just attacked @RandyOrton! Wtf! #WWECapeTown#WWECapeTown (night 1) @WWE," wrote a Twitter user by the name of Richard Kruse.

According to at least three more accounts, the fan leveled Orton in the groin.

"Someone from the crowd just hit in the nuts @RandyOrton #WWECapeTown," wrote one user.

Orton did not retaliate against the fan, but threw the middle finger as he was being dragged out of the ring by arena personnel.

According to another user on the website, some fans who purchased tickets to the event included a meet-and-greet with various WWE Superstars following the event. However, due to the incident, it did not take place.

A user complained to the official Twitter account of GrandWest Casino and Entertainment World, the company that hosted the event, with the following: "@GrandWestSA your security sucks! And I feel cheated out of my R600 I payed to interact with wwe superstars."