Lena Dunham tweets about alma mater's racism troubles

Director Lena Dunham arrives at the 65th annual Directors Guild Of America Awards on Feb. 2, 2013, at the Grand Ballroom at Hollywood & Highland in Hollywood, Calif. / ROBYN BECK/AFP/Getty Images

Lena Dunham is urging her fellow "Obies" to stick together as her alma mater wrestles with reports of racism.

The creator and star of HBO's "Girls" wrote on her Twitter account Monday after learning about racist graffiti at famously liberal Oberlin College in Ohio.

The school, which is about 30 miles from Cleveland, was among the first to admit blacks. And the city of Oberlin was a stop on the Underground Railroad that aided escaped slaves.

Dunham tweeted:

Hey Obies, remember the beautiful, inclusive and downright revolutionary history of the place you call home. Protect each other.

-- Lena Dunham (@lenadunham) March 4, 2013

The 26-year-old also wrote: "This really saddens me. The school I remember was the safest place to do you."

Racist and anti-Semitic messages have been found on campus, and classes were canceled Monday after a report of someone wearing a Klan-type hooded robe.

"Girls" features several characters who met while attending Oberlin. Dunham's character, Hannah Horvath, is one of them.