A truck carrying sound equipment for the MDNA tour has been involved in a serious accident.
One person was injured in the crash and the equipment on board was damaged as the truck overturned near Gothenburg during rush hour.
Police said three cars were damaged, and equipment was thrown into the road.
It is not yet known if the accident will affect the singer's scheduled show in Gothenburg tomorrow night.
Christopher Akesson, a spokesman for Live Nation, the tour's organiser, told the Daily Telegraph: "We are working to prepare for the concert.
"I suspect that if there was anything serious, we would have had information about it by this time."
Earlier in the tour, it emerged that Madonna has a "sterilisation team" who wipe away any DNA in her dressing room after shows on the tour.
Concert promoter Álvaro Ramos, who oversaw the Portuguese leg of her dates, said: "We have to take extreme care, like I have never seen for any other artist. We cannot even look at the dressing room, after it is ready, or even open the door.
"We can only enter after her sterilisation team has left the room. There will not be any of Madonna's DNA, any hair, or anything. They will clean up everything. In the end it is all to protect her and make her feel comfortable.
"I do understand it, but it is taken to extremes."
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