A top official at an observer group that monitored Bangladesh's election, as well as one of its foreign volunteers, have said they regret participating in the process, casting doubt on the credibility of a vote won overwhelmingly by Prime Minister Sheikh Hasina's ruling alliance.

Bangladesh election observers say they now regret involvement in election

Bangladesh's Election Commission is investigating allegations of vote rigging coming from across the country on Sunday, a spokesman told Reuters, as polling for a general election marred by violence drew to a close.

Bangladesh probes vote rigging allegations in election hit by violence

In Bangladesh, a genuine election is necessary for the greater and collective well being the country and its people

Opinion: Bad governance and rigged elections in Bangladesh