Police are looking for vandals accused of spray painting anti-cop graffiti on Saint Patrick's Cathedral. 

At 1:30 Friday morning, investigators say around 150 protesters were being disorderly and blocking traffic at the intersection of 5th Avenue and 50th Street in Midtown Manhattan.

The group was waving Trans Pride flags and Puerto Rican flags as they were yelling profanity and hitting police cars. 

When officers worked to disperse the crowds, they noticed anti-police graffiti spray painted on the cathedral.