1D Zayn Tweets STD Insult At The Wanted's Max

Zayn Malik from One Direction has escalated the band's feud with The Wanted by tweeting a jibe about STDs at Max George.

The pair had been bitching with one another over the social networking site when Zayn raised the stakes by tweeting to Max: "Alright chlamydia boy ;)."

The insult apparently followed a social meeting between Zayn's GF Perrie Edwards (of Little Mix) and Max's ex-GF, Coronation Street star Michelle Keegan.

Both stars have now deleted the majority of their row, but The Mirror reports that it appeared to stem from Zayn repeatedly calling Max a "geek".

Max had tweeted a picture of himself with Gangnam Style star Psy, to which Zayn responded: "The first step is acceptance #geekoftheweek."

Max tried to play along by replying: "Does that mean I'm 'in'."

But Zayn appeared to lose his rag, writing: "I'm not sure why your still talking to me mate conversation ended when I called you a geek. p.s your display just how's how much of a wannabe you are :)"

The exact sequence of tweets is unclear, but apparently Max told Zayn to "Grow up son" - and to "Stay off the bud... It clearly makes u cranky."

The Wanted's Tom Parker and 1D's Louis Tomlinson also got involved in the online handbags, which ended with Max trying to smooth things over but Zayn still stroppy.

Max wrote: "No dramas peeps its all just flirting! Haha."

To which Zayn replied: "Clearly some people are not very familiar with flirting :)."

And his final message is about the only trace of the drama still remaining on his Twitter feed.