Recently, several trains had to be taken out of service after they were covered top to bottom in paint.READ MORE: Police Arrest Man With 37 Prior Arrests In Connection To Attempted Burglary In The Bronx
Authorities say the trains were targeted while they were in tunnels between stations.
READ MORE: Small Plane Makes Emergency Landing On Fire Island Beach
Police say these vandals may not be New Yorkers.
“We certainly have homegrown people that do graffiti from time to time, but we also have people that do this for a living and they come here and they travel from city to city, in some cases from out of the country,” Police Commissioner Dermot Shea said.
The NYPD says it has teams that work with international police to track these vandals.MORE NEWS: Attorney General's Office Opens Investigation Into Fatal Shooting Involving NYPD Officer Yvonne Wu
It costs the MTA thousands of dollars to clean each train.