Fourth of July in Bangor, Maine was full of accidents and tragedy. A man was killed when he was hit by a vintage fire truck, and a four-hour standoff with police resulted in a man's arrest.

The Bangor-Brewer July Fourth parade, which is Maine's largest parade with more than 1,000 participants and 30,000 spectators, according to Gov. Paul LePage, had to be rerouted due to a four-hour standoff in Bangor.

A man, identified as 43-year-old Perrin Oliver, shot a gun, which led to a woman and her baby running for help, CNN reports. The situation escalated to a four-hour standoff between police and the man.

The suspect fired several rounds at police from a second-floor apartment window. Authorities were forced to respond with several shots and tear gas.

Oliver was taken into custody that afternoon and charged with criminal threatening and aggravated reckless conduct with a firearm, both felonies, CNN reports.

Police Sgt. Paul Edwards said this altercation caused the re-route of the parade, which unfortunately resulted in another tragic accident.

A man driving a green tractor died instantly on July 4th after an antique fire truck rear-ended him. Edwards explained that if it hadn't been for the standoff with Oliver, the accident may never have happened.

"They would not have been on that street normally," Edwards said of the people driving the tractor and fire truck.

Edwards said he doubts Oliver will face additional charges in relation to the tractor driver's death.

Bangor police said the investigation is ongoing, and the city's accident reconstruction team, evidence response team and criminal investigations division, the medical examiner's office, and a Maine State Police member are all assisting in the investigation.

In another July 4th accident, a 7-year-old boy died when a trailer pulled by his father ran over him in Oklahoma during a Fourth of July parade.