Should circumstances make the voting impossible to commence, continue, or end, the ward election board, upon agreement with the regional election board or with the divisional election board, shall have the right to adjourn the commencement of voting to a later hour, or to extend polling hours. If and when the voting is interrupted, the ward election board shall deposit election-related documents in safe-keeping, and seal a regular ballot-box and, as the case may be, a portable ballot box so that ballots can neither be inserted nor taken out. When voting is resumed, witnessed by other members of the ward election board the chairman shall examine whether seals are in an intact, or untampered with, condition, and shall remove them. The circumstances that had a bearing upon the interruption of voting shall be stated by the board in its report.