A bus carrying wedding guests rolled over on a foggy night in Australia’s wine country, killing 10 people and injuring 25, police said on Monday.

The 58-year-old driver was arrested and is being held at a Cessnock police station and will be charged, police assistant commissioner Tracy Chapman said.

Ms Chapman would not detail the allegations, including whether speed was a factor, but told reporters “there is sufficient information… for us to establish that there will be charges”.

The crash happened just after 11.30 pm on Sunday in foggy conditions at a roundabout on Wine Country Drive in the town of Greta in the Hunter Valley region of New South Wales state north of Sydney.

Australia Bus Crash
Emergency crews stand near a bus on its side near Greta in the Hunter Valley, north of Sydney (Mark Baker/AP Photo)

The guests had earlier attended a wedding at the Wandin Estate Winery and were heading for their accommodation in the town of Singleton, Ms Chapman said. One guest told Seven News it had been a nice day and a fairy-tale wedding.

A motorist who drove past the crash scene, identified by Australian Broadcasting Corporation (ABC) only as Alison, said the fog was so heavy she could not make out the colours of the flashing lights of police cars, ambulances and fire trucks.

“The fog was terrible,” she told the ABC. “It was super foggy. You could barely see in front of you.”

Of the 25 people injured, 21 remained in hospitals late on Monday morning local time and one was in a critical condition, the state government said.

The conditions of the others were described as stable. Another 18 passengers were uninjured.

Australia Bus Crash
Australian Prime Minister Anthony Albanese makes a statement at Parliament House in Canberra after a fatal bus crash in the Hunter Valley (Mick Tsikas/AAP Image via AP)

Prime minister Anthony Albanese thanked first responders and offered government support to victims and their families, saying the “mental scars of this will not go away”.

“For a joyous day like that, in a beautiful place, to end with such terrible loss of life and injury is so cruel and so sad and so unfair,” Mr Albanese told reporters.

“People hire a bus for weddings in order to keep their guests safe. And that just adds to the unimaginable nature of this tragedy,” he added.

Jay Suvaal, the mayor of Cessnock, said the crash was “truly horrific”.