"If Kabila does not by the end of September set an election date he will "no longer be recognised as president of the republic on October 1."

This is according to the Francois Muamba, rapporteur of the opposition conclave.

The announcement was made after two days of opposition talks in Kinshasa amid concerns that Kabila, in power since 2001, is seeking to remain in place in defiance of constitutional limits.

Elections in the Democratic Republic of Congo are due this year under a transitional deal aimed at avoiding fresh political violence in the sprawling country of 71 million people after Kabila failed to step down when his second mandate ended in December 2016.

Under the deal, Kabila is allowed to remain in office pending the elections, in late 2017, ruling in tandem with a transitional watchdog and a new premier, chosen from within opposition ranks.

Under its newly unveiled plan of action, a two-day general strike will be held throughout the country from August 8 "as a warning", said Muamba.

Then on August 20, the opposition plans simultaneous rallies in the capital Kinshasa and 25 provinces.