LONDON (NYTIMES) - Challenging officers by asking them "searching questions". Flagging down a bus or running into a house. Asking for help from bystanders.

Faced with nationwide consternation over a police officer's rape and murder of Ms Sarah Everard, a 33-year-old marketing executive, the London police have offered several safety tips to women in the event they come face to face with an officer they consider a threat, or someone posing as one.

The tips - issued after Wayne Couzens, the officer who abducted and murdered Ms Everard earlier this year, was sentenced on Thursday (Sept 30) to life imprisonment for her killing - have been met with outrage and derision in Britain.

Couzens' sentencing hearing included shocking details about how he - under the guise of an arrest, although he was not on duty - handcuffed and abducted Ms Everard before raping and murdering her and setting her body afire. And many women asked how realistic it was that the police safety tips would save them if they faced a similar threat.

"This advice in particular shows a fundamental lack of insight into the issue of women's safety with the police," the Women's Equality Party wrote in a post on Twitter, saying that the force had failed to recognise "the huge power imbalance between a police officer and someone they are arresting".

The advice was accompanied by a list of other measures the force had taken or planned to take in light of Ms Everard's murder, including stepped-up patrols and plans for a new strategy to address violence against women and girls.

But critics say the guidance and the other planned measures have done little to calm the fears or reverse the erosion of public trust created by a London police officer like Couzens abusing his position to carry out the attack on Ms Everard. Her murder provoked nationwide outrage and led to calls to improve safety for women.

The police fired Couzens after he pleaded guilty.

Many women said the guidance issued by the police on Thursday raised questions about what they see as a lack of meaningful action taken by the force and the government in dealing with broader issues of violence and misconduct in police ranks.

And they argue the approach once again puts the onus on women to protect themselves while neglecting to address institutional failings. Others pointed out that for people of colour, who may already face mistreatment by the police, the guidance rang particularly hollow.

"Imagine what would happen if a Black or ethnic minority woman/man 'challenged' an officer's identity and intentions when stopped," wrote Ms Zubaida Haque, the former deputy director of the Runnymede Trust, a think tank focusing on racial equality.

Mr Jolyon Maugham, executive director of the Good Law Project, a governance watchdog, said people had lost trust in the police and the criminal justice system.

"You don't restore trust with victim-blaming, and you don't restore trust with preposterous suggestions that people run away if they're not sure if it's a bona fide police officer, or wave down a passing bus driver," he said. "What the hell is a bus driver going to do?"

The Metropolitan Police acknowledged that Couzens' abuse of power had shaken the force and that it was among a number of high-profile cases that "bring into sharp focus our urgent duty to do more to protect women and girls".

It also for the first time acknowledged possible missteps in vetting Couzens before he joined the force and said officials were investigating an allegation of indecent exposure by the officer days before Ms Everard was abducted.

A review into Couzens' vetting process began after his arrest for the killing of Ms Everard, the Metropolitan Police said. While he had passed, the review also found that one of the checks into his background "may not have been undertaken correctly" and failed to turn up an allegation of indecent exposure in Kent in 2015.

Some opposition lawmakers have called for the resignation of the head of London's police force, Dame Cressida Dick, while others have pushed for a broader investigation into potential systemic failures.

Senior government officials responsible for policing have stood behind the police commissioner.

T he government's Crime and P olicing Minister Kit Malthouse acknowledged that the case "struck a devastating blow to the confidence" in the police and had raised questions about how to prevent such attacks from happening in the future. But he said he believed Dame Dick should continue in her position.

"The question in our mind is, what went wrong?" he said during an interview with Sky News on Friday. He said an inquiry would be needed to assess "how this monster slipped through the net to become a police officer" and what could be learned from that to make the police force a "better organisation that has the unquestioning trust of the British people".