Northern Territory Police are investigating the suspicious deaths of three people in the Darwin suburb of Jingili.

Detectives say a caretaker found their bodies about 10:00am on Saturday.

One female body was found out in the open, while two other bodies were in a tent.

Police say the bodies were starting to decompose and believe the deaths occurred 24 to 48 hours ago.

"The bodies were quite decomposed so the information to hand is that persons have probably been deceased for 24 to 48 hours - possibly even longer, we just can't say at this stage," Detective Acting Superintendent Lee Morgan said.

"We haven't ruled out anything and we haven't confirmed anything. There's a whole range of possibilities. And we won't comment on any of those until we get some information."

It is understood the caretaker is providing a statement to police.

"It's quite a horrific scene for him to confront. Fortunately he could only see the one deceased and he wasn't sure about the others. They were inside a tent," Detective Morgan said.

A neighbour says she did not notice anything suspicious at the property in recent days.

"I noticed the rubbish bin. That it hasn't been put away. I saw the bin on Wednesday and it's still out there," she said.

"It's a bit worrisome. Now that I know about it I'm a bit scared."

Details on the identities of the deceased have not been released.

Police are urging anybody with information to contact Crime Stoppers on 1800 333 000.