The Post Office in the UK threatened and lied to the BBC to suppress evidence about the Horizon scandal, which led to the wrongful prosecution of over 700 sub-postmasters. A whistleblower from Fujitsu, the company that built and maintained the Horizon system, revealed that accounts could be secretly altered, contradicting the Post Office's claims. The Post Office's attempts to suppress the evidence ultimately failed, and the scandal has led to a public inquiry and the overturning of convictions. The Post Office has been criticized for its handling of the scandal, including its attempts to intimidate and smear those involved.