Game of Thrones
Pictured: Bronn and Jaime Lannister in "Game of Thrones" Season 6.HBO

HBO's hit TV series "Game of Thrones" Season 6 isn't over yet, but the show has already started casting new characters for its upcoming instalment, Season 7. According to the latest news, the showrunners are on the lookout for two new people to be part of a scene they've described as "high-stakes."

A recent report on "Game of Thrones" fansite Watchers on the Wall claims that the show is casting two new characters -- a 16-year-old girl and a 10-year-old boy with a northern accent -- to be part of a scene with leading characters. No further details are known, except that the characters have to be Caucasian.

The website also claims, "We've also heard there are other child roles being cast at the moment, but we haven't received any more details on them."

Although it's not yet known what characters will be introduced in Season 7, many believe that the show could depict a series of flashbacks in the upcoming instalment as well. If this is indeed true, then Bran's flashbacks could reveal more important information.

The TV show, based on George R.R. Martin's "A Song of Ice and Fire" book series, will reportedly film the scene between September and October 2016. Usually, "Game of Thrones" begins filming in July but the dates could be pushed because the showrunners confirmed earlier that the next few seasons would be shorter.

So far, Season 6 of the TV show has focused heavily on the Starks' reclamation of the North. The recently aired episode 9 titled "The Battle of the Bastards," captured Jon Snow (Kit Harington) and Sansa Stark's (Sophie Turner) dramatic victory over Ramsay Bolton (Iwan Rheon). As Season 6 reaches its end, we wonder if the rest of the Stark siblings, Bran and Arya will join them.

According to spoilers, Arya will make her way back to Westeros in Season 6 episode 10, but it remains to be seen if she will reunite with her siblings.

"Game of Thrones" Season 6 episode 10 airs at 9 p.m. EST on Sunday, June 26, on HBO.