Yet authorities have “developed probable cause to believe it’s intentional,” Sheriff Alex Villanueva told NewsNation prior to Gutierrez’s release Thursday, adding that that he expects the case to be presented to the Los Angeles County District Attorney’s Office on Friday.It was ‘a tragic accident,’ lawyer saysThe 25 recruits from multiple law enforcement agencies were injured Wednesday when a vehicle drove into the group, an incident Villanueva initially labeled “a horrific accident.”The characterization changed Thursday morning when the department announced Gutierrez’s arrest on suspicion of attempted murder of peace officers.CNN has requested comment from Alexandra Kazarian, an attorney for Gutierrez who told CNN affiliate KABC Thursday, “I have no doubt that an in-depth investigation will confirm that Nicholas is a hard-working young man who holds no animosity towards law enforcement, and this was an absolutely tragic accident.”Gutierrez was booked Wednesday, inmate records show.The incident was “hard to see because these young people are getting ready to go put themselves in the line of danger in their career,” Kelliher, the fire captain, said.“And who knows that while you’re training to do that, you’re actually in harm’s way.”CNN’s Eliott C. McLaughlin and Kevin Flower contributed to this report."