News that two

students wore blackface to an off-campus

party has sparked controversy in the Bethlehem school's community.

The students, who are members of a Lehigh fraternity, dressed as tennis stars and sisters Venus and Serena Williams. The men said they didn't know wearing blackface is offensive and have expressed remorse about the incident, university spokeswoman Jennifer Tucker said.

Read Tony Nauroth's complete report:

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This is not the first racially divisive incident at Lehigh in recent years.

In November 2008, following the election of

, two students had racial slurs yelled at them from cars in separate incidents.

Two years earlier, students at an on-campus residence designed to promote racial and ethnic unity found the remains of an animal head on their doorstep.

The school is set to introduce a race relations initiative in the wake of what's happened.

Read Tony Nauroth's complete report:

.