Several cars in a motorcade carrying Minnesota Gov. Tim Walz, the Democratic vice presidential candidate, crashed in Milwaukee.

Mr. Walz was not injured.

The accident happened at around 1 p.m. local time (6 p.m. GMT) on Monday. The cars involved were at the rear of the motorcade and were carrying members of the press who were traveling with Mr. Walz.

Reporters said they were “hurled violently forward” after being hit from behind, causing their vehicle to hit the car in front of them. At least one person was injured.

It is unclear what caused the crash that occurred on Interstate 794.

Vice President Kamala Harris, his running mate, called Mr Walz to check he was OK, a White House official told CBS, the BBC’s US affiliate. Mr Walz said he also received a call from President Joe Biden.

According to a swimming reporter traveling with Mr. Walz, one person apparently suffered a broken arm and was treated by medics.

The disabled vehicles pulled over to the side of the road and Mr. Walz continued his questioning.

Mr. Walz addressed the incident in his speech at a Labor Day celebration in Milwaukee shortly after the accident.

“Some of my staff and members of the press who were traveling with us were involved in a road accident on the way here. We have spoken to the staff,” he told the crowd. “I am relieved to say that with a few minor injuries, everyone will be OK.”

Mr. Walz thanked the Secret Service and local emergency services “for their quick response and assistance.”

Republican vice presidential candidate J.D. Vance also responded to the reports, writing on X, formerly known as Twitter, “I hope everyone is OK.”

This is not the first time the campaign has had to deal with an accident caused by a convoy of cars.

Last week, a Georgia police officer crashed a motorcycle while riding with a campaign convoy.

Police Corporal David Bates was the only person involved in the accident and suffered “serious injuries”.

NPR reported that the cars in the motorcades are often campaign workers who may or may not have driving experience.