In an Internet video, the rebels denounced what they called "the conspiratorial project" and said they intend to establish an "Islamist state" in Syria.
In the video, an unidentified speaker sits at the head of a long table with at least 20 others, in front of a black Islamist flag.
He listed some 13 armed Islamist groups who reject the opposition coalition, the BBC reports.
“We are the representatives of the fighting formations in Aleppo and we declare our rejection of the conspiratorial project, the so-called national alliance,” he said in the video.
“We have unanimously agreed to urgently establish an Islamic state,” he added.
According to the report, the EU recognised the new coalition on Monday as ‘legitimate representatives’ of the Syrian people, but did not grant it full recognition.
France has already backed the group as ‘sole representative’ of Syrians, the report said.
London: Islamist rebel groups in the Syrian city of Aleppo have rejected the new Western-backed opposition coalition that seeks to oust the country’s President Bashar al Assad.
First Published: Tuesday, November 20, 2012, 14:08