Government ministers have been accused of failing to protect whistleblowers despite their role in exposing a series of major scandals.
The Commons Public Accounts Committee said the treatment of whistleblowers was often "shocking," with bullying and harassment from colleagues.
However, government departments were unable to say whether any action had been taken against their persecutors.
The committee highlighted the important role played by whistleblowers in uncovering the scandals at the Mid Staffs NHS hospital trust and policing of the Hillsborough football stadium tragedy.
More top news
Sadiq Khan has said that his prospects of being elected London mayor could be damaged by the party's poor handling of racism accusations.
US President talks about meeting Royal toddler in his last address at the annual White House correspondents' dinner.
Clocks will go forward 30 minutes so there is half an hour more daylight in the evening when energy consumption peaks.