Apparently the four piece have been battling personal animosities and rivalries for the past three years - most notably a feud between Harry Styles, 21, and Louis Tomlinson, 23.
According to The Sun, the pair fell out spectacularly in 2012 - leaving them barely able to talk to each other unless for work purposes or in public.
A source close to the band told the newspaper: "Apart from Harry and Louis, no one knows exactly what caused the falling out. They didn't even tell the other boys the full details.
"But it was very serious and their friendship has never recovered. Everyone involved in the band is well aware of the animosity between them."
The report claims the team surrounding the band have been struggling to keep a lid on the tensions ever since the alleged falling out, which is said to have caused a massive divide within the band.
Things became so bad apparently, that Harry insisted he travelled in a different private jet to his fellow band member!
Niall Horan, 22, is said to be 1D's unofficial peacekeeper, and still talks to everyone.
The insider adds: "Liam and Louis are the only real friends left in the band. Niall likes everyone as that's part of his happy-go-lucky persona."
The five piece - including Zayn Malik who left earlier this year - found fame on The X Factor in 2010.
Although the band's break is described as an 'extended hiatus', this is deemed dependant on how successful their solo careers are.
Watch the official video to One Direction's 'Drag Me Down' below:
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