Mastic residents held a protest Friday after learning a home on Eleanor Avenue will house six high-risk sex offenders.Residents gathered near Montauk Highway to voice concern that, in recent years, more and more sex offenders have been placed in residential neighborhoods in Mastic and Shirley. They say those placements pose grave dangers to children. The sex offenders moving into the Eleanor Avenue rental are all classified level three, or high-risk. Neighbors say they blame the landlord for allowing the six to move in.Some of the protestors are pushing Brookhaven Town officials to pass saturation laws that limit the number of sex offenders allowed to live in any one neighborhood at any time. So far, they say talks with the town have been positive. Town officials say they are investigating whether saturation laws are constitutional.