One man died and four other people were taken to hospital with suspected heroin overdoses in just 48 hours, a hospital said.
It has prompted a warning from doctors about what they believe is a particularly potent batch of heroin being used in the area.
The medics say it is unusual to have so many separate cases of drugs overdoses in such a short space of time.
Olivia Paterson sent this report.
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Isolated showers clearing. Drier on Sunday, brightest in the west.
Up to 20,000 people are expected to visit the first Duxford air show since the Shoreham disaster on the South coast.
Dry and fine across most parts, with some sunshine.