This went down in Shanghai last week, at a shopping center that happened to have a decorative aquarium in the lobby. The tank cracked, then shattered, sending water and fish and turtles and three lemon sharks flooding onto visitors. It's like that scene from Jaws 3-D which no one saw so I don't know why I brought it up.
The sharks are harmless to humans, so they didn't attack any of the visitors. Also they were too busy flopping around and dying. Three sharks died, and 15 people were injured by broken glass. A spokesman for the mall said "they are not going to build an aquarium again in the future."