Bismarck, N.D. (KXNET)- This weekend, volunteers spent time on both sides of the Missouri River in Bismarck and Mandan looking for a young man who hasn't been seen in days. Searchers were out once again on Saturday and Sunday to try and find Renzo Bullhead.Bullhead is a member of the Standing Roc k Sioux tribe and was attending classes at United Tribes Technical College.Bullhead has been missing for a week after a friend of his said he talked to Bullhead on the phone and that Bullhead had asked to be picked up in Bismarck as he was about to walk across the rail bridge.Mandan police say that bullhead didn't show up on the Bismarck side of the bridge. "Please come together and help us search for my son," Renzo's mother Diedra Leaf said. "Whether it's in the water or even on land. There's hope there. He might have had an injury." "Our hearts go out and prayers go out to the family. This is a really difficult thing for the family, but I think for all of our people collectively, because unfortunately, it happens more often than we would like," Standing Rock Sioux Tribal chairwoman Janet Alkire said. As of Sunday evening, friends and family say they still haven't found Bullhead, but plan to continue searching. If you have any information that may help find Bullhead, you're asked to call Mandan police at 701.667.3250. ...read more read less