RANGERS' director Chris Graham has resigned in the wake of a police and club investigation into a sexually explicit cartoon of the prophet Mohammed he is alleged to have tweeted.

The club has confirmed that the fans leader who had become an non-executive director had stepped down.

A club statement says: "Chris Graham has tendered his resignation as a Director of Rangers International Football Club (plc). This has been accepted by the Board."

Graham, who had been a non-executive director just 24 hours when claims he sent a tweet purporting to show the prophet  engaged in a gay sex act to a radical Islamist preacher were revealed, is also facing a robust investigation by Rangers.

Scottish Muslim leaders had joined calls for Rangers to take action. One MSP called on the club to "accept their responsibility to set a positive example".

The fallout from the saga has also seen far-right groups, including the BNP, and former English Defence League leader Tommy Robinson attempt to gain political capital from it. Robinson called for Rangers fans to "bring Mohammed cartoons to games".

Mr Graham, who acts as Rangers Supporters Trust spokesman, is alleged to have sent the tweet to Anjem Choudary in the aftermath of the Charlie Hebdo shootings.

Part of the message sent from 38-year-old's account on Twitter and accompanying the drawing read: "You probably won't like this one...then."

Mr Choudary had previously tweeted that "freedom of expression does not extend to insulting the prophets of Allah, whatever your views on the events in Paris today".

Rangers fans chief Chris Graham apologised for sending the "inappropriate" tweet which forced him to resign as a club director after just three days.

Graham now admits he should not have not have sent the tweet.

He said: "Freedom of speech is one of the foundations that our country is built upon. However, with that freedom comes a responsibility to be sensitive to the views of all our nations' communities.

"This tweet did not do that. For that I apologise unreservedly.

"I also tweeted my support for the Muslim community during exchanges that day but even so I accept that retweeting that cartoon was inappropriate.

"I am extremely proud to have played a part in helping Rangers to secure regime change but I have had to take this decision for my family and the club itself.

"I wish the current board the very best of luck going forward."

Among other tweets allegedly sent from Mr Graham's account were sexual comments about Celtic chief executive Peter Lawwell, a description of former manager Neil Lennon as "the Lurgan bigot" and claims fans of the Parkhead club were behind the burning of the Rangers team bus.

In one blog, on ex-Rangers chief executive Charles Green's use of racist language, Mr Graham said: "Nobody associated with Rangers should be using that type of language. If a director of one of Europe's elite clubs had made such a comment they would have been sacked or forced to resign. Should Rangers be any different?"