MONTREAL - Three former federal tax officials are facing fraud and corruption charges over an alleged extortion attempt against restaurant owners.

The ex-employees of the Canada Revenue Agency are accused of extorting payment in exchange for lower income-tax assessments.

The RCMP says the three Montreal-area men are expected to appear in court on June 11.

The men charged include two tax auditors and a division head; the charges include extortion, bribery of officers, fraud against the government and breach of trust.

Police say the revenue agency began investigating in 2008, and an investigation is continuing with further charges possible.

None of the three men work for Canada Revenue Agency anymore -- two were let go in 2011 while another resigned in 2009.