At least 10 people were killed in a bus crash after a wedding in Hunter Valley, New South Wales. Photo / Nine News

Ten people have died and another 11 have been rushed to hospital after a coach reportedly rolled in the Hunter Valley town of Greta, north of Sydney.

Emergency services rushed to the scene shortly after 11.30pm on Sunday night and a large-scale emergency response began, New South Wales police said in a statement.

Police said initial enquiries indicate that 10 people died in the crash and 11 were taken to hospital by road and helicopter.

7News reported the bus was returning from a wedding when it crashed into a roundabout and rolled.

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

”We are a major wedding and tourist destination in the Hunter Valley, and so there will be people from all over the state and the country that have been to these areas and have probably done similar things,” he told Network Nine.

“I think it will send shock waves right through the broader community.”

One wedding guest told Today it had been a “fairytale” wedding.

“We just got the news that there has been a crash and we all started panicking,” he said.

“Nobody knows what is going on.”

A further 18 people were uninjured in the crash.

The 58-year-old driver was taken to hospital under police guard for mandatory testing and assessment.

Specialist crash investigation and forensic units are now at the scene and police warn that road closures “will be protracted”.

- with AP