The Liberal Party is requesting a recount in the federal riding of Châteauguay-Lacolle after Elections Canada reported what it called a “potential anomaly” in the count that saw the Bloc Québécois candidate defeat the Liberal by 286 votes, CBC News has learned.

Elections Canada confirms it detected a possible issue with one of the ballot boxes after the results had been finalized. The agency did not offer details.

“Since validation, Elections Canada has become aware of a potential anomaly with the results reported for a single ballot box at an advance poll,” Elections Canada spokesperson Natasha Gauthier said in a statement to CBC News.