UPDATE: Penwortham 'sudden death' investigations continue
Police vehicles could still be seen outside a residential property on Meadow Bank this afternoon.
Door to door inquiries were also taking place in the area.
Residents said they had seen emergency services - including police vehicles and ambulances - and police forensic officers at the house this morning.
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Hide AdLancashire Police have not as yet revealed the circumstances surrounding the incident.
A spokesperson for Lancashire Police said earlier today: "We are investigating a sudden death. There's a male with some injuries we think might be natural causes."
One resident, Arthur Dixon, 80, who lives opposite the house, said: "I don't know anything. I went out and saw two ambulances there, that's all I know."
Mr Dixon, who said he had lived there for about 25 years, said: "It would be about 10 o clock. I'd been out, came back and they were still here."
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Hide AdHe added that he knew little about who lived at the property in question.
"I don't know, I think they're new. I don't know them across there," he said.
The owner of a neighbouring property, who asked not to be named, said of the properties in the area: "I think they're all lets mostly. I couldn't tell you who lives there or whatever."
Another neighbour just around the corner from the property, who also did not want to be named, said: "I've been out all morning, came back and saw a crime scene - they were putting their white overhauls on.
"I don't know who lives there. I live on this side."
Lancashire Police are expected to release more details later.