MASS killer Jeremy Bamber has unearthed new evidence in his battle to overturn his conviction for shooting dead five relatives in Essex, it was reported.

According to a national newspaper report, he has found a police phone log suggesting his father Nevill called police on the night of the 1985 massacre, saying his daughter had “gone berserk” and “got hold of one of my guns”.

Bamber, now 50 and serving a whole life sentence for the killings, claimed that his sister Sheila Caffell, a model known as “Bambi”, shot her family before turning the gun on herself.

The police log, published in the paper, is timed at 0326 on the day of the massacre, August 7, 1985.

Titled “Daughter gone berserk”, it says: “Mr Bamber...White House Farm...daughter Sheila Bamber aged 26 years has got hold of one of my guns.”

The memo is similar to another police phone log timed 10 minutes later which details a call that Bamber himself made to police from his home in Goldhanger, three and a half miles from White House Farm.

In that, he tells of a call from his father saying that Sheila had gone crazy with a gun.

Bamber has been behind bars for more than 23 years for shooting his wealthy adopted parents, June and Nevill, sister Sheila and her six-year-old twin sons Daniel and Nicholas at their farmhouse in Tolleshunt D’Arcy, Essex.

The prosecution at his trial said he carried out the murders out of greed, hoping to inherit a GBP500,000 fortune. Last year he lost a Court of Appeal challenge against the order that he must die behind bars and he twice lost appeals against conviction.

Essex Police was unable to comment on the fresh evidence claim.