Four workers were hurt, three critically, after a barn frame collapsed Saturday at an $80 million Texas A&M University equestrian complex that’s under construction. The collapse happened on university property about a mile from the main campus, Texas A&M spokesman Lane Stephenson said. College Station and Bryan fire departments, campus police and Texas A&M emergency medical personnel all responded to the accident, which happened shortly before 11 a.m. Saturday. The accident involved an approximately 300-foot barn, according to the College Station Fire Department.