Authorities in Ireland are investigating whether a second American woman was involved in a suspected international plot to kill a Swedish cartoonist for mocking the Prophet Mohammad, The Wall Street Journal reported on Friday.

According to the Journal's online report, a 31-year-old mother from Colorado named Jamie Paulin-Ramirez was one of seven people detained in Ireland on Tuesday.

Irish police said they were arrested in connection with a plot to kill cartoonist Lars Vilk because of his 2007 drawing depicting the Prophet Mohammed with the body of a dog.

The U.S. Justice Department said on Tuesday it had charged a Pennsylvania woman, Colleen LaRose, who went by the pseudonyms Fatima LaRose and JihadJane, with plotting to kill a Swedish man.

Officials at the Justice Department were not immediately available for comment on The Wall Street Journal report.

The Journal said one of the people detained in Ireland was an Algerian man who was the main contact for LaRose. That man has a relationship with Ms. Paulin-Ramirez according to a person close to the matter, the newspaper reported.

The arrests in Ireland included two more Algerians, a Croatian, a Palestinian and a Libyan, according to the story.

Paulin-Ramirez announced nearly a year ago she had embraced Islam and last September 11 left her home in a small Rocky Mountain town to marry a Muslim man in New York she had made contact with via an Internet website, the newspaper said.

The Journal interviewed Paulin-Ramirez's mother, Christine Holcomb, in Colorado. I'm angry with her right now, she was quoted saying. I'd like to just choke her. But I'm worried about her, too. I love my daughter.

The newspaper said Paulin-Ramirez gave her mother an address in Waterford, Ireland.

The Justice Department also has accused LaRose of trying to recruit fighters to commit violent attacks overseas.

(Reporting by Richard Cowan; Editing by Anthony Boadle)