The incident took place at the Stonewall Pride Parade & Street Festival in Wilton Manors, just north of Fort Lauderdale.
"Our fellow chorus members were those injured and the driver was also part of the Chorus family", said Justin Knight, president of the Fort Lauderdale Gay Men's Chorus, according to a statement obtained by Local 10 and other outlets.
"To my knowledge, this was not an attack on the LGBTQ community", Knight said in his statement.
Fort Lauderdale Mayor Dean Trantalis, who was at the event, earlier called the incident a "terrorist attack against the LGBT community".
While Fort Lauderdale Police Detective Ali Adamson said authorities are investigating all possibilities, some witnesses claimed the crash seemed intentional.
"We have to look at all angles, and that is what we are doing", she said, adding that the Federal Bureau of Investigation was assisting.
"The parade had just begun and we saw people lining up and ready to move and all of a sudden this white pickup truck dashed right through the crowd, barely missing congresswoman Wasserman Schultz's vehicle by inches and smashed through a gate", the mayor said.
As the Associated Press reported earlier Saturday, a driver "slammed into spectators Saturday evening at the start of a Pride parade in South Florida, killing one man and seriously injuring another".
The collision happened during the Wilton Manors Stonewall Pride Parade. "Video of the arrest showed the driver wearing a gay men's chorus t-shirt, which was more than enough to [sow] reasonable doubt about the intent of the driver", Florida-based radio host Grant Stern wrote on Twitter. "Our hearts are breaking and we continue to pray no more innocent lives are lost", she tweeted.
"What started as a celebration quickly turned to tragedy at today's Stonewall Pride Parade", Broward County Sheriff Gregory Tony said in a statement.
"It was definitely an intentional act right across the lanes of traffic". "Out of respect for everyone involved the parade has been cancelled and a thorough investigation is being conducted". May the memory of the life lost be for a blessing'.
June is Pride Month, commemorating the June 1969 police raid targeting gay patrons at the Stonewall Inn in NY that led to an uprising of LGBTQ Americans and served as a catalyst for the gay rights movement.