CALGARY, Alberta Alberta may file charges against a U.S. hunter who posted a video of himself killing a black bear with a spear, wildlife officials said on Tuesday, as the Canadian province moved to ban spear hunting.The video, which sparked outrage online, shows hunter Josh Bowmar baiting a trap for the bear in a wooded area and then impaling the animal with a long spear with a camera attached to it.Bowmar, 26, defended the way he killed the bear while Alberta Environment Ministry spokesman Kyle Ferguson described the hunt as “unacceptable” and “archaic.””We will introduce a ban on spear hunting this fall,” Ferguson said. “In the meantime, we have asked Fish and Wildlife officers to investigate this incident to determine if charges are warranted under existing laws.”Bowmar, a javelin thrower and hunter, uploaded the video in June, local media reported. It appears to have been taken …