The police are investigating “dozens of people” at the Post Office and Fujitsu, announced the head of a national operation.
A team of 100 agents nationwide is investigating potential suspects and their involvement in the Post Office scandal.
Hundreds of deputy postmasters were wrongly prosecuted for stealing from their branches between 1999 and 2015 after faulty Horizon software caused accounting errors.
Last month, Sky News exclusively revealed that at least four suspects were under investigation and the offenses considered were those of perversion of the course of justice and perjury.
A meeting was held between senior Metropolitan Police officers and victims, including Sir Alan Bates.
They were told that agents are currently reviewing at least 1.5 million documents involving thousands of victims.
Commander Stephen Clayman, who headed Operation Olympos, said “dozens” of people at the post office and Fujitsu were under investigation.
He added: “We will go where the evidence leads us… our enduring goal is the pursuit of justice.”
So far, three people have been questioned under caution, and there are plans to question more suspects in 2025.
If the Public Prosecution Service decides the standards of proof are met, any potential trial would not take place until at least 2027.
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Former deputy postmaster Jess Kaur has been wrongly accused of 36 counts of theft from her post office in Aldridge, West Midlands.
She suffered a nervous breakdown and attempted suicide.
Ms Kaur said it was “pretty disgusting” that a trial was years away, but she said she understood police needed time to properly investigate.
“There’s not just one or two (to investigate), so it will take time,” she told Sky News. “I hope they do a good job, we don’t want to rush them.”
She added, however, that “hundreds of people were immediately put behind bars” when they were falsely accused of stealing from the Post Office.
“We’ll never know what was going on behind the scenes, but it’s all being revealed,” she said.
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Officers from the UK Police Force and the National Crime Agency work together to investigate potential crimes.
Commander Stephen Clayman described the former deputy postmasters and their families as being “at the heart of this investigation”.
“The scale of the task at hand is unprecedented,” he said, adding that agents are supported by “cutting-edge technology” to help them analyze the evidence in the documents.
“I can’t promise it will be a quick process. An investigation of this magnitude must continue to be carried out carefully and methodically and will take time.
“However, I speak for our entire team when I say we will approach it with independence, precision and integrity.”