Munich police say the opening of the venue where Oktoberfest is taking place has been delayed because of possible connections to an explosion and fire at a house in the city, in which one person has died.

Mayor Dieter Reiter said the Theresienwiese would remain closed until at least 17:00 (15:00 GMT) on Wednesday because of a bomb threat.

A large-scale emergency operation is currently under way in Lerchenau in the north of Munich. Police said it was triggered by a fire in a single-family home. Reports indicated that residents heard an explosion.

Police said possible links to other locations were being investigated, including the festival site at Theresienwiese. For this reason, the opening of the festival grounds has been delayed, said police.

Oktoberfest runs from 20 September until 5 October and has already attracted more than 3.5 million visitors, described as the world's largest folk and beer festival.

Authorities investigating the fire in Lerchenau believe a residential building was deliberately set alight as part of a family dispute. The victim found at the scene has since died, and another missing person is not believed to pose any danger.

Moreover, police reported finding booby traps in the affected building, which prompted the call for special forces to defuse them. Numerous emergency personnel are currently on scene.