Hamilton police said they found evidence of falsified documents, including a dead man listed on voter rolls, after investigating a Progressive Conservative nomination meeting that took place nearly two years ago but didn't have enough evidence to lay criminal charges.

Investigators said Monday that they were closing the probe into the May 2017 Tory nomination meeting for the riding of Hamilton West-Ancaster-Dundas.

Police started the investigation after one of the candidates, Vikram Singh, alleged fraud had resulted in another candidate winning the contest. Investigators said Monday they could proceed no further.

"Two arrests were made, but those individuals were subsequently released unconditionally," police said in a statement. "Hamilton Police have reviewed the matter with the Crown Attorney and at this time, there is insufficient evidence to proceed with the laying of criminal charges."

Police said their investigation focused on a number of ballots cast at the meeting that all appeared to be marked in a similar manner and came from the same desk at the event. All of those votes were cast for one candidate, Ben Levitt, who won the race. Levitt won a second nomination race as well but did not win the seat in last spring's election.

Investigators say they found evidence that some credential forms filed at the meeting from that desk were falsified and that the individuals named on the forms did not attend or vote at the meeting.

Police said they also found that a person listed on one of the forms had died a week before the meeting was held.

Hamilton police said they seized over 60 items as evidence during the probe including ballots, credential forms and emails. Officers interviewed nearly 150 witnesses from multiple jurisdictions, they said.

Progressive Conservative Party spokesman Marcus Mattinson said the allegations took place under the watch of previous party leader Patrick Brown and said Premier Doug Ford has addressed the issue.

"He took immediate action to set aside the nomination and re-opened it under a transparent and fair system," he said in a statement.

Brown said the investigation clears party officials of any wrongdoing but noted that there are still lessons to be learned that could improve the volunteer-driven nomination meetings.

"The nominations we had during my time as leader produced the vast majority of Premier Ford's caucus," he said in a statement. "He has a lot of talent in his caucus and on his front bench because of the nominations conducted during my time as PC leader."