The Canadian arm of Humane Society International is offering a $1,000 reward to help find who's responsible for the bludgeoning deaths of 50 seals on the shores of eastern P.E.I. last weekend.

Necropsy results on 10 of about 50 seals found washed up dead showed they were bashed with a blunt object.

"What we do know was that this was a vicious act of cruelty that was absolutely criminal in nature and must be prosecuted by the authorities," said Rebecca Aldworth, executive director of the animal rights group in Canada.

The necropsy also showed that not all the animals died instantly from their injuries and that all were left to freeze.

The seals were found dead or dying by a group of veterinary students near Beach Point.

In a release, the group called the deaths a "massacre."

Humane Society International said the Department of Fisheries and Oceans was forced to euthanize many of the seal pups.

They are calling for charges under both the Fisheries Act and the Criminal Code of Canada.

The deaths were not connected to any sanctioned seal hunt so charges could be laid.

Officials from DFO are investigating.

They are encouraging anyone with information to call Crime Stoppers.

Also on HuffPost:

WARNING: SLIDESHOW CONTAINS DISTURBING IMAGES
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    The following slideshow contains potentially graphic images.

  • Canadian Seal Hunt

    Seal hunters use a hakapik, a club used for killing seals, to kill a seal near their boat in the Gulf of Saint Lawrence March 31, 2008 near Charlottetown, Canada. (Photo by Joe Raedle/Getty Images)

  • Canadian Seal Hunt

    Seal hunters skin harp seals on an ice floe March 30, 2001 in the Gulf of St. Lawrence in Canada. (Photo by Darren McCollester/Newsmakers)

  • Canadian Seal Hunt

    The bodies of harp seals, roughly twenty days old, lie on an ice floe March 27, 2001 in the Gulf of St. Lawrence in Canada. (Photo by Darren McCollester/Newsmakers)

  • Canadian Seal Hunt

    The carcass of a harp seal, roughly twenty days old, lies on an ice floe March 30, 2001 in the Gulf of St. Lawrence in Canada. (Photo by Darren McCollester/Newsmakers)

  • Canadian Seal Hunt

    The carcass of a harp seal, roughly twenty days old, lies on an ice floe March 30, 2001 in the Gulf of St. Lawrence in Canada. (Photo by Darren McCollester/Newsmakers)

  • Canadian Seal Hunt

    The carcass of a harp seal, roughly twenty days old, lies on an ice floe March 30, 2001 in the Gulf of St. Lawrence in Canada. (Photo by Darren McCollester/Newsmakers)

  • Canadian Seal Hunt

    Seal hunters carry dead seals in their boat in the Gulf of Saint Lawrence March 31, 2008 near Charlottetown, Canada. (Photo by Joe Raedle/Getty Images)

  • Canadian Seal Hunt

    A policeman tries to remove female animal-rights activist Ashley Fruno (R), covered with a body-painting to look like the Canadian flag, during her one-woman anti-sealing protest by People for the Ethical Treatment of Animals (PETA) outside the Canadian embassy in Tokyo on March 24, 2010. (TORU YAMANAKA/AFP/Getty Images)

  • Canadian Seal Hunt

    Animal rights activists, Sir Paul McCartney(R) and then-wife Heather Mills McCartney get up close to a seal pup during a venture onto the ice floes of the Gulf of St-Lawrence before the start of the 2006 seal hunting season in Charlottetown, Prince Edward Island. (DAVID BOILY/AFP/Getty Images)

  • Canadian Seal Hunt

    Members of the organization for the defense of animals AnimalNaturalis protest naked and painted as bloody seals to protest the seal hunt in Canada on March 15, 2010. (Getty)

  • Canadian Seal Hunt

    Members of the organization for the defense of animals AnimalNaturalis protest naked and painted as bloody seals to protest against the seal hunt in Canada on March 15, 2010. (Getty)

  • Canadian Seal Hunt

    Inuit hunter Pitseolak Alainga (L) explains how the Inuit traditionally hunt seal to Canada's Finance Minister Jim Flaherty outside the Nunavut Legislature in Iqaluit, Canada, February 6, 2010. (GEOFF ROBINS/AFP/Getty Images)

  • Canadian Seal Hunt

    An animal-rights activist holds a baseball bat as he stands next to a person wearing a seal costume during a protest against the killing of seals in Canada on March 29, 2010 in Munich, Germany. (Photo by Miguel Villagran/Getty Images)

  • Canadian Seal Hunt

    An animal-rights activist wears a mask depicting the face of a seal during a protest against the killing of seals in Canada on March 29, 2010 in Munich, Germany. (Photo by Miguel Villagran/Getty Images)

  • Canadian Seal Hunt

    People protest in front of the Canadian Consulates, on March 25, 2009 in Nice, south eastern France, to protest against the seal hunt in the Gulf of Saint Lawrence in Canada. (VALERY HACHE/AFP/Getty Images)

  • Canadian Seal Hunt

    Having recently returned from a trip out to the ice floes to collect seal heart valves for scientific research, local butcher and seal hunter, Rejean Vigneau (R) and AN employee (L) prepare seal meat in his meat shop on March 25, 2008 in the Magdalen Islands of Quebec, Canada. (DAVID BOILY/AFP/Getty Images)

  • Canadian Seal Hunt

    The Grim Reaper clubs a mock seal to death during a protest by the animal rights group PETA (People for the Ethical Treatment of Animlas) in Hong Kong, 21 April 2006. (MIKE CLARKE/AFP/Getty Images)