"We look at any kind of suspicious death on the high seas, " said Wolf, a spokesman for the bureau's Baltimore field office.
The paper says the forensic scientist who investigated his suicide was a junior assistant who had never worked on a suspicious death before.
Scientists don't usually test for cyanide in the battery of toxicology tests they may run in a suspicious death and don't generally look for it unless there is a reason to suspect it.
CNN: Lottery winner exhumed; cyanide deaths rare, experts say
Police said they were called to his home in Leeds, but that there was nothing suspicious about his death.
Although officers say there is nothing suspicious about the death of Charlie Booth, they had referred the case to the independent police complaints body.
Police said Mr Gough had no fixed address and they are not treating his death as suspicious.
There are no suspicious circumstances surrounding his death and a report will be sent to the procurator fiscal.
Cumbria Police said her death was suspicious and want to hear from anyone whose "loyalties may have changed".
Police are not treating the death as suspicious, although post-mortem tests proved inconclusive.
Det Insp Les Newman confirmed there were no suspicious circumstances over the death.
Police said on Wednesday they were treating the death as suspicious, but after further investigations had now launched a murder inquiry.
Lothian and Borders Police said there were no suspicious circumstances surrounding his death and a report would be sent to the procurator fiscal.
Police said they were not treating Lynsay Jackson's death as suspicious.
There were no suspicious circumstances surrounding his death.
He was later released without charge when officers concluded the death was not suspicious.
BBC: Norwich man William Phillips died 'after row with cyclist'
Cleveland Police said a post-mortem examination found she died of choking and the death was not suspicious.
BBC: Pentland Primary School pupil dies after choking on food
Mr Howard - the cyclist - was arrested 10 days after the incident, but was later released without charge as police concluded the death was not suspicious.
They said Ms Tyler's death "is being treated as murder" and her son's death "non-suspicious".
BBC: Mark Tyler shot mother Maureen before himself, police say
Police have ruled out suspicious activity regarding Reid's death and turned the investigation over to the coroner, CNN affiliate WFMZ reported.
Hague said Foreign Office officials were first made aware on January 18 of rumors within China's British expat community of possible suspicious circumstances in Heywood's death.
Police said an exact cause of death had yet to be established but his death was being treated as suspicious.
The family of a 16-year-old whose death is being treated as suspicious has appealed for help in gathering details about his final days.
"While initially it was thought that we were dealing with a sudden death, officers became increasingly suspicious of the circumstances, " said Det Ch Insp Ian Pollard.
The death is not being treated as suspicious and the coroner has been informed.
BBC: Suffolk teacher arrested in sex abuse inquiry found dead
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