A man and a woman have been taken to hospital with burns after an explosion at an Adelaide unit this morning.

Key points: Residents from a block of units at Camden Park were evacuated following an explosion

Residents from a block of units at Camden Park were evacuated following an explosion A man and a woman were taken to hospital with burns

A man and a woman were taken to hospital with burns Police said the unit may have housed a drug lab

Police, paramedics and MFS crews were called to a block of units on Anzac Highway, Camden Park just before 5:30am after reports of a loud bang.

A 46-year-old man suffered serious but non-life-threatening injuries, including burns, while a 36-year-old woman sustained minor injuries and burns.

They were both taken by ambulance to the Royal Adelaide Hospital and have since been arrested.

Police said it appeared there had been some sort of explosion in the bathroom of the unit, and the pair would be formally interviewed by officers "at the earliest opportunity".

Neighbours said they could smell chemicals after the explosion. ( ABC News: Matthew Smith )

Detective Chief Inspector Scott Fitzgerald said police were investigating whether a drug lab was in the unit, saying it was lucky the explosion had not injured others.

"Police have evacuated the units associated or close to this particular unit and are working with the fire service and Housing Trust to make the place safe," he said.

"The explosion has structurally interfered with the building.

"The two people who are inside are very, very lucky and at this stage their condition is stable."

The unit's wall shows significant damage from the blast, with cracks appearing and bricks displaced.

Police said investigators were unable to enter the unit until it has been deemed structurally safe.

Inspector Fitzgerald said the two injured people were claiming there was a third person, not known to them, also in the unit at the time of the explosion.

A man and a woman have been taken to hospital. ( ABC News: Matthew Smith )

Neighbour Elaine was among the residents from the unit block who were evacuated after the blast.

"Apparently an explosion of some sort, and I smelt all this horrible chemically stuff," she said.

"[The police] came and evicted us out because of the building not being safe."

One lane of eastbound traffic on Anzac Highway was closed as emergency vehicles attended the scene.