It happened on New York Avenue in Huntington Station around 2:30 p.m. Wednesday.
The 16-year-old victim told police he was at the fast-food restaurant with friends when six of his classmates from Huntington High School entered and began staring at them menacingly.
Feeling uncomfortable, the victim and a friend left, and the three gang members followed them, wielding bats and knives, police said.
An altercation broke out in the parking lot, and that's when 19-year-old Ramon Arevalo Lopez allegedly stabbed the victim in the back. Another 16-year-old boy suffered a minor injury in the fight.
The stabbed 16-year-old was later taken to Good Samaritan Hospital Medical Center with non-life threatening injuries.
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The suspects took off, but police caught up with them and arrested them about a mile away.
Lopez and two other suspects, 20-year-old Nobeli Montes Zuniga and 17-year-old Oscar Canales Molina, were charged with second-degree assault.
Police said they had blood on their clothing and hands during the arrest. Molina was found with two knives, one in each of his socks.
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According to police, Lopez entered the United States illegally on December 8, 2016. He was picked up by the Department of Homeland Security in October 2017, but a federal judge released him from custody in June.
Zuniga and Molina entered the country illegally as unaccompanied minors. Molina was picked up by DHS in July 2017 but released by a federal district judge in November 2017.
The suspects were arraigned Thursday. Bail was set for each at $35,000 cash/$75,000 bond.
Police continue to investigate the incident.
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