Authorities are investigating a Sunday morning bias incident in which swastikas, anti-Semitic writings, profanities and the name of the MS-13 gang were spray-painted on walls, doors and windows in the rear of Syosset High School, Nassau County police said.

A school security officer discovered the vandalism at the building on South Woods Road shortly before 7 a.m., according to detectives, who said the spray-painting was likely done between 2 a.m. and 4 a.m.

Detectives ask anyone with information to call Nassau County Crime Stoppers at 800-244-TIPS. All callers will remain anonymous.

Flu cases surge on LI ... Top holiday movies to see ... Visiting one of LI's best pizzerias Credit: Newsday

Wild weather on the way ... Flu cases surge on LI ... Top holiday movies to see ... Visiting one of LI's best pizzerias

Flu cases surge on LI ... Top holiday movies to see ... Visiting one of LI's best pizzerias Credit: Newsday

Wild weather on the way ... Flu cases surge on LI ... Top holiday movies to see ... Visiting one of LI's best pizzerias

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