The leader of African Centre for Leadership Strategies and Development, Mr Humphrey Bekaren, who spoke on behalf of the observers, made the call in Port Harcourt.
He said the observers were shocked that INEC disregarded the widely reported violent irregularities to begin the process of declaring results in the state.
“We request all lovers of democracy to join us in calling for the outright cancellation of the phony election.
“Unless this is done, we would have sown the seed that could eventually grow into providing a shade of fear and death over us,” he said.
According to Bekaren, what happened in Rivers was a far cry from what election should be.
“What we saw did not meet international standard of electioneering, not even the ones set by the Independent National Electoral Commission INEC,’’ he said.