Five days after a retired college dean was shot and killed on a recreation trail near a Vermont University campus, students returned to classes on Tuesday, some on edge, a day after police urged residents to remain vigilant, lock doors and to report any tips that might help them identify and find the killer. Honoree Fleming, a retired dean and professor, was found shot dead on Thursday afternoon on the Delaware and Hudson rail trail about a mile south of the Castleton campus of Vermont State University. The shooting happened during the school’s week-long fall break. The university reopened on Monday but students were excused from classes. “I recommend to the public to be vigilant, have some awareness,” Maj Dan Trudeau, commander of the Vermont state police’s criminal division, said. “If you’re out, be with a friend because we don’t really know yet if the community is in any further danger. We don’t know if this is isolated or not isolated and we’re still trying to develop leads to further figure that out.” A witness reported a possible suspect was northbound on the trail walking towards the campus after gunshots were heard, police said. The witness described a 5ft 10in white man with short, red hair, last seen wearing a dark gray T-shirt and carrying a black backpack. State police said he is considered to be armed and dangerous and asked anyone who might have seen him to call them. The Castleton police chief, Peter Mantello, said they don’t know if this was a random or targeted shooting and advised residents of the town of about 1,200 and students to be diligent by locking their cars and doors. While the university boosted security on campus and advised students to travel in groups and lock their doors, some students said they wished classes would stay cancelled while the investigation is ongoing. “I was hoping that they would extend their break, trying to figure out if they can try and catch this guy, just so I could feel more safe,” sophomore Jasmine Traverse told mynbc5. Other students said they feel safe because of what the university is doing. “I do feel safe, not necessarily on the trail at this moment, but in general on campus, I do feel safe,” Pearl Bellomo told WCAX-TV. Police said they have received more than 200 tips as they search for the killer. Detectives have been interviewing nearby residents and people who were on the trail around the time of the shooting, police said. Vermont police canvassed the trail on Monday looking for any additional evidence, authorities said. “Please, as far as the public goes, provides us tips,” Trudeau said. “Anything noteworthy that you found on cameras, something maybe you drove by and noticed and thought of after the fact. We’re primarily interested in anyone who was walking on the rail trail that day … in the timeframe of 3pm to 5pm.” The Castleton campus of Vermont State University cancelled classes on Monday to ensure that the school community “has the time and space to process and grieve”. “Following the tragic death of a member of our community in Castleton on Thursday, we want to express our deepest condolences to all members of our community who knew and were touched by Dr Honoree Fleming,” the school said in a Facebook post. “Her contributions to education and her impact on our campus will live on in all of us.” Fleming was married to the author Ron Powers, who co-wrote the book Flags of Our Fathers, about the men involved in the famous flag-raising during the 1945 Battle of Iwo Jima. A Pulitzer winner in 1973 for criticism as a television-radio columnist, he also wrote a biography of Mark Twain and collaborated with the late US senator Ted Kennedy on the politician’s memoir True Compass.