MILWAUKEE — Three cars in the back of the motorcade escorting Democratic Vice Presidential nominee Gov. Tim Walz to a campaign event in Milwaukee were involved in a crash just before 1 p.m. Monday.

The crash occurred on Interstate 794. The motorcade was traveling from Milwaukee Mitchell Internation airport to Milwaukee Area Labor Council’s “Laborfest 2024” in downtown Milwaukee at the Summerfest grounds. Walz is scheduled to speak there this afternoon.

Walz’s vehicle was not involved in the accident and he is not hurt. 

President Joe Biden called and spoke to Walz a short time later, as the president was traveling to a separate campaign stop in Pittsburgh with Vice President Kamala Harris. Harris’ campaign said that she also spoke with her running mate by phone after the crash and that he was not injured.

The Harris campaign said the crash involved cars near the rear of the motorcade. Walz, who is also the governor of Minnesota, was riding closer to the front.

The White House said Harris was briefed on the collision and spoke with Walz to check on him and the staff. She’s expected to get updates throughout the day.

Upon arriving at his event, Walz spoke briefly about the crash saying “some of my staff and members of the press that were traveling up with us were involved in a traffic accident on the way here today.”

“We’ve spoken with the staff. I’m relieved to say that with a few minor injuries, everybody’s going to be okay,” Walz said. “President Biden and Vice President Harris called to check in, and we certainly appreciate their concern, and I want to express my sincere thanks to the U.S. Secret Service and all the local first responders for their quick reaction.”

It wasn’t immediately clear what caused the crash. The Milwaukee County Sheriff's Office confirmed it is investigating the crash; that investigation is underway and ongoing. 

The van carrying the reporters remained pulled over on the side of the road for several minutes afterward.

According to the press pool, a member of the traveling pool staff, who was in a van carrying reporters, was injured. The press pool said the person appeared to have a broken arm and was being treated by medics. 

Some reporters had scrapes and bruises, and one had a bloody nose. Another feared having suffered a concussion and was initially looking to be taken to urgent care — but eventually climbed aboard a new van to accompany the rest of the press to the event.

All who wanted to be checked out by paramedics were assessed, according to the pool report.

“We were violently thrown forward, as our van slammed into the one in front of us and was hit from behind,” Jazmine Ulloa, who was in the motorcade and reports for the New York Times, said in a press pool update.

Walz and his motorcade stopped at the hospital a few hours after the crash so he could check on staff members who were involved.

The crash occurred after Walz and his wife, Gwen, were greeted at the airport by Democratic Rep. Gwen Moore of Wisconsin. The trio embraced, chatted, and posed for a photo before the motorcade began heading to the event.

Monday’s campaign stops marking Labor Day were Walz’s first aboard the Harris-Walz campaign charter aircraft. It bears decals of an American flag, the words Harris-Walz, and “A New Way Forward.”

This story is developing. Check back for updates.