Investigators say a woman was walking from the park along the Bow River Trail around 3:30 a.m. Sunday when she was snatched from behind by a stranger. The perpetrator, who was holding a knife, tried to drag the woman to the river, but she reacted and managed to escape. He reached a nearby security guard, who called the police. In a briefing Tuesday, police released CCTV footage of a “person of interest related to this case”. They said they hoped the public would be able to help police locate and locate the person. Police described the man as wearing a dark jacket and a light-colored tuck with a mask and holding a green or gray “tactical” backpack. “Calgary remains a safe city. However, we are a big city with big city challenges and we must all work together to ensure a vibrant center that is safe and welcoming to all,” said Staff Sgt. Greg Cooper in a press release on Tuesday. Anyone with information is kindly requested to call the police emergency number at 403-266-1234 or contact Crime Stoppers.