A German student suffered a black eye and cut lip after he was attacked in a park.
The student, who has not been named, was attacked in Stoneham Park, Hove.
Four men jumped out of a van which had stopped in Stoneham Road at 5.40pm on Saturday.
One of the men punched the student in the face while the others watched.
Sergeant Steve Barry, of Hove police, said there had been a number of separate attacks on foreign students recently.
The others had taken place in parks in Portslade two weeks ago.
Operation Columbus was set up in Sussex four years ago to discourage incidents involving foreign students and local people.
Sgt Barry said: "We want students from other countries to be aware we take their safety very seriously.
"Since this time last year, an anti-victimisation unit has been set up in the city.
"It is part of their job to look at attacks on foreign students and to offer them somewhere to report incidents to."
Anyone with information about the latest attack, or who would like to report an attack, can do so by calling 0845 60 70 999.
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