(CNN) North Carolina's election board voted again Friday to delay certification of the election results in the 9th Congressional District amid allegations of irregularities and possible criminal activity with absentee ballots, a move that could potentially lead to a call for a new election.

The 7-2 vote from the bipartisan board gives its lawyers and investigators less than a month to further examine allegations of improper activities that have been filed with the board, at least one of which claims an unidentified woman filled out an absentee ballot for a voter.

Should evidence be found of voter fraud, that could change the outcome of the 905-vote margin between Republican Mark Harris and Democrat Dan McCready, the board could potentially call for a new election.

McCready conceded the race to Harris the day after the election earlier in November, but the state Democratic Party has filed affidavits with the board of voters purporting there were potential illegal activities.

One affidavit filed by the Democratic Party alleges Republican McCrae Dowless, who has a history of being accused of improper voter activity in Bladen County, could financially benefit from handling absentee ballots for the Harris campaign. Dowless is also alleged to have claimed he had 80 people working for him on two races, including the 9th District. Another affidavit alleged Dowless said he'd receive a $40,000 bonus if Harris won the election.

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