MIAMI (CBS NEWS)  – Three people were transported by emergency personnel to a hospital, and others brought themselves in for treatment after a shooting during a Miami Martin Luther King Jr. Day celebration, reports CBS Miami.

Police said a total of seven people were injured, three of whom were juveniles. It wasn’t clear whether all were shot.

A source told the station two of the wounded were in critical condition after the incident, which occurred at Martin Luther King Jr. Memorial Park. Celebrants had gathered at the park following the city’s annual parade to honor the civil rights icon.

Two individuals have been detained, and two weapons have been recovered, Miami-Dade police said via Twitter.   

Police have not said if a motive in the incident is known.

In a tweet, Miami-Dade Police Director Juan Perez called the incident “shameful.”

“Certainly not what the followers of Dr. King Jr. want out of our community,” he wrote.