New York police are investigating the spray painting of swastikas and other anti-Semitic messages on walls, doors and windows of a Long Island high school.

Nassau County police say “MS13” and profanities also were found painted in the rear of Syosset High School. MS-13 is the Salvadoran-based street gang that has been blamed for more than 20 killings on Long Island in the past year and a half. It was not immediately clear who was responsible for the graffiti.

Syosset School Board trustee Joshua A. Lafazan issued a statement decrying the graffiti. He said he will call for increased security at all the school district’s 10 buildings.

Detectives believe the vandalism occurred between 2 a.m. and 4 a.m. Sunday.

I am appalled by the disgraceful anti-Semitic graffiti found at Syosset HS. We have zero tolerance for bigotry and hate of any kind

— Andrew Cuomo (@NYGovCuomo) August 28, 2017

(AP)