'I couldn't help anybody': Colorado witnesses describe terror as shots rang out

Store customers describe heartache of not being able to help some of the victims

• Report: 10 killed, including police officer, at Boulder supermarket

Shoppers and staff have described their terror as they fled for their lives when a gunman opened fire in a Colorado supermarket.

Sarah Moonshadow, 42, a customer and resident of Boulder, was in the store with her son, Nicholas, on Monday and recounted scenes of pandemonium as gunfire rang out.