More than 30 people have been rescued following an explosion in a mine in eastern Germany.

The staff were trapped 700 meters (2,300 feet) below ground following an unexplained blast, police said, adding "all personnel have been rescued."

The mining authority said one of the staff was seriously injured, according to the Mitteldeutsche Zeitung news website.

Before the rescue, those trapped were supplied with oxygen and took refuge in a safe section of the mine in Teutschenthal, about 150 kilometers southwest of Berlin, near the city of Halle.

The mine was closed in 1982 but is being used to deposit mining waste from elsewhere, the website said. Around 100 people are employed at the site.