PHILADELPHIA -- Disturbing hate letters and threats have left some Asian market owners rattled, prompting an investigation by Philadelphia police and the Federal Bureau of Investigation.

Video: Aryan Nation Suspected In Hate Mail The letters threatened the rape of Asian women and the bombing of Asian businesses.

"I'm angry and I'm disgusted because this is not the way most Philadelphians are," said Ken Wong, an Asian American community activist.

The letters were sent Friday to at least three Asian businesses -- one in Center City and two in South Philadelphia.

Police said that members of the Aryan Nation are claiming responsibility.

"The author of this letter indicates that they are from the Aryan Nation and that these people are basically being targeted because of their ethnicity," said Philadelphia Police Inspector Bill Colarulo.

Wong said that the disturbing letters were also sent with graphic pictures.

"There are photographs of Asian bodies, so it's pretty shocking," Wong said.

Philadelphia police said that they have confiscated the letters.

"Needless to say, we are taking the threats seriously and we are taking the proper precautions to protect the citizens of Philadelphia," Colarulo said.

Conmmunity activists in Philadelphia said that since the police have taken possession of the three letters, three or four other business owners said they had received similar letters. Within a week, a town meeting will be held to discuss the issue.