Tasmania Police are investigating a fire that occurred overnight at a landfill site in the northern part of Hobart, deeming the incident suspicious.

The fire broke out at the Jackson Street Landfill and Recycling Centre located in Glenorchy on Friday evening, prompting a response from fire crews throughout the night.

Authorities reported that the flames were initially ignited by mattresses, which then spread to surrounding waste materials.

Residents in the vicinity shared images of the blaze on social media, leading to the issuance of a smoke alert for those living nearby.

By 8:30 AM on Saturday, firefighters had successfully contained the fire.

Police are urging anyone with information regarding the incident to reach out by calling 131 444. Additionally, tips can be submitted anonymously through Crime Stoppers at 1800 333 000 or via their website at crimestopperstas.com.au.