Before US President Joe Biden visited Pittsburgh, a snow-covered bridge with an important transport link collapsed in the US metropolis.
Three people have been taken to hospital with injuries, officials said.
These are not life-threatening injuries.
The bridge fell nearly 20 meters onto a pedestrian walkway in a park.
During his visit to Pittsburgh in the afternoon, Biden wants to talk about, among other things, the modernization of the dilapidated infrastructure in the United States.
John Fetterman, lieutenant governor of the US state of Pennsylvania, told CNN that the bridge collapse underscores in a "terrible way" how urgent the infrastructure deficiencies in the United States are.
The Lieutenant Governor added: "Fortunately, because of the weather, schools start two hours late, so there was less traffic than on a normal day."
The bridge was an important traffic artery into the city.
He himself drove over the bridge several times.
"It's surreal." Pictures showed a bus and some vehicles on the remains of the bridge.