The sons of a murdered Maltese journalist on Thursday dismissed Prime Minister Joseph Muscat's offer of a reward to help find her killers and called for him to quit.
Mr Muscat has ruled out quitting and has vowed to bring those responsible for killing a reporter he has described as his "greatest adversary" to justice, with the help of FBI investigators.
On Wednesday Mr Muscat told parliament the government would put up a "substantial and unprecedented reward" for information leading to a conviction over Monday's car bomb killing of anti-corruption campaigner Daphne Caruana Galizia.
Her sons revealed the government was putting up a million euros, but said they would not bow to pressure to endorse the idea.
"We are not interested in a criminal conviction only for the people in government who stood to gain from our mother's murder to turn around and say that justice has been served," they said.
"The prime minister asked for our endorsement. This is how he can get it: show political responsibility and resign."
Caruana Galizia had used her widely-read blog to highlight numerous cases of suspected corruption, including several scandals implicating Mr Muscat's inner circle which had left her facing a string of legal suits.
Her sons - Matthew, Andrew and Paul - said Mr Muscat should resign because he had worked to "cripple our mother financially and dehumanise her so brutally and effectively that she no longer felt safe walking down the street".
"And before resigning he can make his last act in government the replacement of the Police Commissioner and Attorney General with public servants who won’t be afraid to act on evidence against him and those he protects," they said.
Mr Muscat called and won an early election in June after the late journalist said she had evidence his wife, Michelle, was the beneficiary of a secret Panama bank account.
Caruana Galizia, 53, alleged the account was used to stash kickbacks from Azerbaijan's ruling family linked to an Azeri bank gaining a licence to operate in Malta.
Mr Muscat asked a magistrate to investigate the claims and has vowed to quit if any link is established between him and hidden offshore accounts.
The investigation, which the opposition has derided as rigged, is ongoing.
The journalist's killing has caused shock around the world and prompted much soul-searching in Malta over whether the country is becoming a cesspit of corruption against the backdrop of an economic boom which some see as having allowed both organised crime and a kickbacks culture to flourish.
