Surveillance video of the attack after the city's annual gay pride parade.
CNN  — 

The Miami-Dade State Attorney’s Office is reviewing evidence to determine if four men should be charged with hate crimes in an attack on three men after Miami Beach’s annual pride parade, a spokesman said.

The attack occurred several hours after the April 8 event, outside a public restroom on the parade route.

Surveillance footage of the incident shows four people pouncing on two men outside the restroom. On the video, the group takes turns pushing and punching the two men in the head as a bystander tries to intervene.

Juan C. Lopez, 21; Luis M. Alonso, 20; Adonis Diaz, 22; and Parblo Reinaldo Romo, 21, each face two counts of aggravated battery with prejudice for each victim, according to the court documents. The charging document accuses the defendants of intentionally targeting the victims because of their perceived status.

CNN has reached to out to the defendants’ lawyer for comment. Each entered a written plea of not guilty on April 10, according to court records.

Since then, prosecutors considered whether the hate crime enhancement should be applied. Such an enhancement could bring harsher penalties.

Alonso faces an additional charge of assault with prejudice for allegedly threatening one of the victims, who told police that he yelled an anti-gay slur before hitting him several times, according to a police report.

The bystander was knocked to ground in the chaotic tangle, and the footage shows his head striking the pavement. The defendants face an additional charge of aggravated battery for his injuries, which apparently required staples for treatment, according to the charging document.

Miami Beach Police released surveillance camera footage of the beating.

CNN’s Kevin Conlon contributed to this report.