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An interim report by MPs has described the practice of undercover police "borrowing" the identities of dead children "ghoulish and disrespectful".
It found that fake identity records such as passports, driving licences and national insurance numbers had been issued using the details of the dead children.
Today's report calls for the families of the children involved to be given an "unambiguous apology" from the forces involved.
The case that placed undercover policing in the spotlight was that of Pc Mark Kennedy who posed as a campaigner in protest groups over seven years from 2003.
He was outed by accident when his real passport was discovered. He went on to offer help to protesters in a trial regarding Ratcliffe-on-Soar power station, which led to the trial falling apart.
It was later revealed that he had had sexual relationships with at least two women in the protest movement.
A number of women who say they were deceived into having relationships with undercover officers - and not just Mark Kennedy - are suing the Metropolitan Police for damages.
Here are some of the conclusions from the Home Affairs Select Committee interim report.
On undercover policing:
On sexual relations:
On using dead childrens' identities:
Rt Hon Keith Vaz, chair of the Home Affairs Select Committee, has called for a "clear code of conduct" for police officers operating undercover.
He told ITV News that cases of undercover police officers fathering children with their subjects, or using the identities of children who have died, were "abhorrent".
"This isn't James Bond, this is happening," he added.
Undercover policing laws are ambiguous to the point where ordinary people are at risk of having their private lives infiltrated, an influential group of MPs has warned.
An interim report by the Home Affairs Select Committee says there is an "alarming level of inconsistency" among ministers and senior police officers over the limits of the law.
The issue came to light in 2011 after it was revealed that undercover police officer Pc Mark Kennedy had had sexual relations with women in the environmental group he was trying to infiltrate.
It was later revealed that some undercover police officers used dead children's identities to build cover stories, a practice described as "ghoulish" in the MPs' report.