The Rainbow Bridge border crossing is closed to all traffic in both directions following a "vehicle explosion" on the U.S. side, according to the FBI and local officials. 

At approximately 1 p.m. the FBI's Buffalo office issued a statement on social media that said it was investigating the car explosion, calling the situation "very fluid." 

#FBI Buffalo statement on investigation at the Rainbow Bridge: pic.twitter.com/jRaGLL8sU8

— FBI Buffalo (@FBIBuffalo) November 22, 2023

The incident reportedly involved a vehicle on the U.S. side of the border crossing. At approximately 1:30 p.m., the Ontario Provincial Police confirmed in a video that the Fort Erie Peace Bridge and the Lewiston-Queenston Bridge also shut down. 

"We are closely monitoring the situation. State agencies are on site and ready to assist," said New York State Governor Kathy Hochul. 

US/CANADA border closures in Niagara/Fort Erie. Stay tuned for updates ^ks pic.twitter.com/LKUm3DlmwD

— OPP Highway Safety Division (@OPP_HSD) November 22, 2023

"At my direction, the New York State Police is actively working with the FBI Joint Terrorism Task Force to monitor all points of entry to New York. I am traveling to Buffalo to meet with law enforcement and emergency responders and will update New Yorkers when more information becomes available."

Several videos posted on social media show flames and a cloud of smoke above the border crossing. 

#BREAKING: An explosion has been reported at the Rainbow Bridge in Niagara Falls at the Canada-U.S. Border. pic.twitter.com/NxPnBSRFVZ

— 6ixBuzzTV (@6ixbuzztv) November 22, 2023

According to multiple reports and law enforcement officials, two individuals believed to be in the vehicle at the time of the incident have now been pronounced dead. 

🚨#BREAKING: A vehicle entering a toll booth at Rainbow Bridge has caused a large explosion to go off, prompting evacuations.⁰⁰📌#NiagaraFalls | #Canada

Currently, multiple authorities and emergency personnel are on the scene, with evacuations underway after a vehicle… pic.twitter.com/CGJnKIm6u5

— R A W S A L E R T S (@rawsalerts) November 22, 2023

"We are aware of an evolving situation at Rainbow Bridge. We are liaising with our U.S. counterparts on this matter. The FBI is leading on the ongoing investigation," the Canada Border Services Agency said in a statement just after 2 p.m. 

In a video uploaded just after 5 p.m., OPP Sgt. Kerry Schmidt revealed that the Fort Erie Peace Bridge, Whirlpool Bridge, and Lewiston-Queenston Bridge have now reopened. Rainbow Bridge remains closed for further investigation. 

New York Governor Kathy Hochul said in a press conference on Wednesday evening that "there is "no indication of a terrorist attack" at this time, but that the investigation is ongoing. 

This is a developing story. More information to come...