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Reporter: Detective Inspector, how can suicides be linked?

Lestrade: Well, they all took the same poison. They were all found in places they had no reason to be. None of them had shown any prior indication.

Reporter: But you can't have serial suicides.

Lestrade: Well, apparently you can.

Reporter: These three people, there's nothing that links them?

Lestrade: There's no link we've found yet but we're looking for it. There has to be one.

[TEXT MESSAGE] Wrong!

Sally Donovan: If you've all got texts, please ignore them.

Reporter: It just says "Wrong".

Sally Donovan: Well, just ignore that. If there are no more questions, I'm going to bring this session to an end.

Reporter: If they're suicides, what are you investigating?

Lestrade: As I say, these suicides are clearly linked. It's an unusual situation, we've got our best people investigating.

[TEXT MESSAGE] Wrong!

Reporter: Says "Wrong" again.

Sally Donovan: One more question.

Reporter: Is there any chance that these are murders? And if they are, is this the work of a serial killer?

Lestrade: I know that you like writing about these but these do appear to be suicides. We know the difference. The poison was clearly self-administered.

Reporter: Yes, but if they are murders, how do people keep themselves safe?

Lestrade: Well, don't commit suicide.

Sally Donovan: Daily Mail!

Lestrade: This is a frightening time for people but all anyone has to do is exercise reasonable precautions. We are all as safe as we want to be.