Boy group The Wanted were reportedly forced to apologise to One Direction earlier this month after criticising them in a magazine interview.
According to heat magazine, the group's management "freaked out" after reading the singers hit out at The X Factor runners up.
The Wanted had said that One Direction were "just faces" rather a group, adding: "We don't talk. The X factor family stick together."
The group's Nathan Sykes also took a swipe at the group's success in the charts, saying: "If you look at One Direction's chart position then look at ours, they're not really even our rivals."
But The Wanted's management weren’t pleased with the comments.
"Their management told them that slagging off One Direction could turn their own fans against them," a source said. "That's why they tweeted saying it had 'all been blown out of proportion'. It was their way of apologising."
A source in the One Direction camp added: "They're angry about The Wanted slagging them off. They think it's a low blow and they were shocked Max would say that."
Meanwhile it looks like One Direction will get the last laugh, currently on course to debut on top of the US album charts later this week.
If they manage the feat - which will involve knocking fellow Brit Adele from the top spot - they'll make history as the first ever UK group to debut at number on the US charts, outperforming even The Beatles.