Sussex Police said a group of Austrian teenagers who were on a ten-day school trip to Brighton were attacked on the beach by people trying to sell them drugs.
One of the teens was knocked unconscious and another was left with a serious cut after being hit in the face with a bottle.
Police said the students were ‘set upon’ when they declined to buy drugs from the group.
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A Sussex Police spokesperson said: “Around 30 of the teenagers were sitting on the beach, just west of Palace Pier, about 9.15pm on Friday, October 5, celebrating a 16th birthday when the incident occurred.
“They were approached by six men and one woman who attacked five of the students, who were on a ten-day school trip to the city.
“A number of them were attacked, resulting in a 15-year-old boy being knocked unconscious and a girl, also 15, hit in the face with a bottle, causing a serious cut that is expected to result in scarring.
“The students returned to Austria on Wednesday (October 10).”
Police are seeking witnesses or anyone who has any information about the incident or those involved. Please report online or call 101 quoting serial 1253 of 05/10.
Sussex Police said a 17-year-old boy from Mitcham was arrested on suspicion of grievous bodily harm with intent, assault occasioning actual bodily harm and affray. He was bailed to return on November 1.
A 14-year-old boy from Crawley was arrested on suspicion of affray and later also bailed to return on November 1, police said.