Police use videos of naked calamity to warn of synthetic marijuana K2's dangers

NEW YORK -- There's an alert from the NYPD about a highly dangerous synthetic drug known as K2.

It is growing in popularity on the streets of New York.

The department released graphic video of a man in Brooklyn who stripped naked and went berserk on a street. The man was not high on K2, but the department merely played the video clips to demonstrate "examples of the type of behavior often associated with Excited Delirium Syndrome (ExDS)."

K2 is synthetic marijuana that causes extreme reactions.

Many users hallucinate and become impervious to pain.

"It's synthetic and it's incredibly dangerous and harmful. Again, a lot of the bodegas particularly up in East Harlem and elsewhere attempt to sell it and keep it under the counter. So, some of the undercover work we are doing would deal with those places that are trying to sell it and market it," Police Commissioner William Bratton said.

Another reaction from K2 is extreme strength.

Police say the drug is putting officers in danger, as well as users.

More than 10,000 packages of K2 have been seized in the city recently.