The family of an 80-year-old woman set on fire outside her flat have said they "can't understand why" it happened.
Brenda Raymond, who is in hospital in a critical condition, was found alight in a communal area of a block of flats at Caractacus Cottage View, Watford, on Monday afternoon.
Officers previously said they believed some kind of liquid was sprayed on her as she returned home before she was set on fire.
