When the hour-long service came to a close, police officers again formed a guard of honour as PC Bone's coffin was carried outside, with her hat, black leather gloves and Queen's Diamond Jubilee medal on top.
The security camera footage shows Sierra eating alone in the food court of a shopping mall near the hostel where she was staying and walking around the mall, dressed in jeans, a brown leather jacket and a winter hat, her hands in her pockets.