Security at a U.S. school has been stepped up after a racist video rant by two of its white female students went viral.

Santaluces High School, in Lantana, Florida, is on high alert for possible retaliation attacks after the two girls poked fun at the way black pupils 'talk' and wear their weave hair extensions.

It comes hot on the heels of similar footage posted by two teenagers from nearby Gainesville last week who received death threats after also making disparaging comments against black students.

In this latest disturbing video, the girls start by saying white students 'turn black' as soon as they enter the school, claiming you 'catch the disease'.

At one point they add: 'Guys, if you're watching this video now, and you have a weave, and you're black, please be offended - because we're making fun of you. It ends with one of the girls saying: 'Don't post this on Facebook because all our friends are black.' They chuckle, flash peace signs and say 'peace and love'.

A district education spokesman said the school, which is 27 per cent white, 35 per cent black and 33 per cent Hispanic, was aware of the video.

A statement read: "Appropriate action will be taken according to district policy. Racist comments are unacceptable and have no place in our school district." And The Palm Beach Post newspaper said the school was stepping up its security after the girls' video went viral.

School Police Chief Jim Kelly added that, because social media is so new, it did not have a policy in place to deal with such incident. But, he said, he would not be looking into it to develop one.

The video is the second in a week to outrage America.

Last week two teenage girls were forced to drop out of their high school in Gainesville, when they began getting death threats after their 15-minute racist rant about 'black people'. The girls cheerily complained about the African-American students in their classes and dragged out a litany traditional racist stereotypes.


Will the girls parents be paying for the extra security costs?