LONDON (AFP) - The future of British rock group Oasis was plunged into doubt Saturday after lead guitarist Noel Gallagher dramatically announced he was quitting because he can no longer work with his brother Liam. Its with some sadness and great relief to tell you that I quit Oasis tonight, Noel said in a brief statement posted on the bands website Friday. People will write and say what they like, but I simply could not go on working with Liam a day longer. It brings an end to months of speculation about the future of Oasis, which was at the vanguard of the Britpop music wave of the mid-1990s and went on to become one of the most commercially successful British bands in years. Lead singer Liam and Noel, his older brother and the main songwriter, have had a notoriously stormy relationship since the band formed in 1991, but rumours grew in recent days that their differences had become insurmountable. Noel, 42, announced his decision after the group suddenly cancelled a concert at a music festival near Paris on Friday, with organisers saying the brothers had had a fight backstage shortly before they were to play. A spokesman for the organisers of the Rock en Seine festival told the 30,000 crowd: The group no longer exists. They will not play tonight and they are cancelling the rest of their European tour. The director of the festival, Francois Missonnier, told journalists: For reasons which are unclear, a fight broke out between the brothers. Noel left the festival and no one could make him come back. British singer Amy Macdonald, who was playing at the festival, wrote on her Twitter page: Oasis cancelled again with one minute to stage time Liam smashed Noels guitar, huuuge fight Last weekend the band pulled out of a concert at the V Festival in Chelmsford, southern England, with organisers saying Liam, 36, had lost his voice due to viral laryngitis. The cancellation prompted media suggestions of a split, but Liam rejected this the following day on his Twitter page. After Paris, Oasis had been scheduled to play at the Rock am See festival in Germany and in Milan. In his statement, Noel apologised to fans who had bought tickets for the concerts. Liam revealed this month that his relationship with his brother was so bad that they no longer speak, travel separately on tour and only see each other on stage. He told NME magazine: It takes more than blood to be my brother. The groups fans took to Twitter to express their sadness at Noels departure. PsychedelicAdam posted: Noel Gallagher leaves Oasis? Gutted, no more Oasis then I guess, they were one of my favourite bands. Another fan, MattGriffin, said: This is the worst day ever. Oasis are one of the most commercially popular British rock groups of recent years, with reports putting their worldwide record sales at more then 50 million. Their guitar-driven songs, with a nod to the Beatles, were at the forefront of the mid-1990s wave of British bands whose music was dubbed Britpop by critics. Noel was even invited to tea with then prime minister Tony Blair. Liam was part of the original lineup, with Noel joining soon after. Originally known as The Rain, the band had changed their name by the time they made their debut album Definitely Maybe in 1994. The following year, they released the critically acclaimed album (Whats the Story) Morning Glory? and had a public feud with London-based Britpop band Blur although both groups later admitted the row was ridiculous. Be Here Now, released in 1997, became the fastest-selling album in British chart history, but reports of the brothers huge rows and rock star excesses were filling newspapers. The bands popularity waned and subsequent albums received a lukewarm reception, but they have found fresh success with their most recent albums, Dont Believe the Truth and Dig Out Your Soul.