Police and charities working with older people all offer advice on crime prevention measures for the elderly, ranging from not keeping large sums of cash at home, to installing an entry phone or using a door chain.

BBC: Protecting the elderly

Cordero said that the woman had cracked opened the inner of two front doors but that the outer door was closed with a chain.

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When they returned, the front door was locked and there was a chain on from the inside, blocking their way.

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The roof is connected by an elongated bicycle chain to a garage-door motor that rolls it back at the flick of a switch.

FORBES: A Star Is Born

Officers discovered the door of that apartment ajar, but secured from the inside with a chain lock.

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