The mother bear had been wearing a tracking collar because of a study to try to determine whether black bear numbers are dwindling in the region.
Once the men realized that she had been wearing a collar, they realized that they might get in trouble, since hunting bears requires a permit and the hunt can only occur during specific times.
They slaughtered the mother bear's body and packed up the meat to bring with them. They put the bodies of the cubs in a bag and took it with them. And one man even went into the den to make sure they didn't leave behind any further evidence.