Police say the group chased the teenager, punched and kicked him, and then stabbed him in the back.
Police believe the victim is a migrant from Nicaragua. Officers arrested seven people on Thursday night, but police are still searching for 16 others.
Two hours after that attack, a 28-year-old man was beaten outside the Hard Rock Café. Police arrested three teens in that case. Two other suspects are being sought.
Doctors expect both victims to survive.
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