June 5 (Reuters) - The following are the top stories in the Financial Times. Reuters has not verified these stories and does not vouch for their accuracy.

Headlines

- HSBC placed under formal investigation over Lebanese central bank scandal.

- Betfair targeted gambling addict, court hears in landmark case.

- Andy Burnham confirms he will seek to replace Starmer as UK prime minister.

-Mandelson investigation may take more than a year, says top UK prosecutor.

Overview

- French prosecutors have brought preliminary charges against HSBC's HSBA.L Swiss division over allegations it helped former Lebanese central bank governor Riad Salameh embezzle funds.

- Flutter's FLTRF.L Betfair targeted a problem gambler with free bets and promotions that worsened his addiction before he took his own life, lawyers for his family argued at a landmark trial.

- Andy Burnham has vowed to seek to replace Keir Starmer as prime minister should he win a parliamentary by election in Makerfield and return to Westminster.

- Police investigations into Peter Mandelson and Andrew Mountbatten-Windsor could take more than a year to conclude, according to England's chief prosecutor.