Demanding arrest of the school principal and two teachers of a school accused of sexual harassment of a class IX student who committed suicide at her Noida home on Tuesday evening, the family members and friends on Thursday blocked Noida-Delhi link road in Mayur Vihar. Both the stretches have been forced shut since 12:15pm. The Delhi traffic police have diverted some traffic, but still a large number of vehicles were queued up. Besides demanding the arrest of the accused, the family members are seeking a CBI probe.