Washington, Nov 23 : The FBI was investigating a vehicle explosion at the Rainbow Bridge border crossing between the US and Canada near Niagara Falls as an attempted 'terrorist attack', the media said, citing unnamed sources. Two people in the vehicle are dead and one border patrol official has been injured, the report said on Wednesday, Reuters reported. A vehicle explosion at the bridge was being investigated, the Buffalo Field Office of the FBI said in a statement on X. All four international border crossings in Western New York were closed on Wednesday due to an incident involving a vehicle at the bridge, according to local media. Reuters could not immediately confirm the report. Authorities in New York state were "closely monitoring" an incident on the bridge and state agencies were on site, New York Governor Kathy Hochul said in a post on X on Wednesday. Law enforcement teams in Canada were "actively engaged in assessing the situation," Ontario Premier Doug Ford said in a post on X. Border agency officials in the US had no immediate comment, while their Canadian counterparts did not immediately respond to a request for comment, Reuters reported. Representatives for the US State Department also did not immediately respond to a request for comment on the reported border closures. /IANS