( CNN ) The FBI charged a Philadelphia woman on Thursday with trying to travel overseas to fight for ISIS . She 's one of three women arrested this week on terror charges . Two New York women were also taken into custody . An FBI complaint cites numerous social media messages dating back to August 2013 that were sent by Keonna Thomas , 30 , also known as `` Young Lioness '' and `` Fatayat Al Khilafah . '' One Twitter message said , `` If we truly knew the realities ... we all would be rushing to join our brothers in the front lines pray ALLAH accept us as shuhada [ martyrs ] . '' Another said , `` When you 're a mujahid [ violent jihadi fighter ] your death becomes a wedding . '' The FBI said Thomas purchased an electronic visa to Turkey on March 23 . Turkey is known as the easiest place from which to enter Syria and join ISIS . An ISIS manual advises recruits to buy round-trip tickets to vacation spots such as Spain and then purchase tickets for their real destination once they arrive overseas , the FBI said . On March 26 , Thomas purchased a ticket to Barcelona , with a March 29 departure and an April 15 return to the United States , the complaint said . It 's not clear when or where she was arrested . She was charged with knowingly attempting to provide material support and resources to a designated foreign terrorist organization . She could be sentenced to 15 years in prison . On Thursday , Noelle Velentzas , 28 , and her former roommate , Asia Siddiqui , 31 , were arrested in New York and accused of planning to build an explosive device for attacks in the United States , federal prosecutors said . In the past 18 months , the Justice Department 's National Security Division has prosecuted or is prosecuting more than 30 cases of people attempting to travel abroad to join or provide support to terrorist groups . Of those cases , 18 allegedly involve support to ISIS . `` The terrorist threat is more decentralized , more diffuse , more complicated , '' Homeland Security Secretary Jeh Johnson told reporters Thursday . `` It involves the potential lone wolf actor , it involves the effective use of social media , the Internet . ''
The ISIS cites social media messages sent by Keonna Thomas , 30 . She 's accused of trying to travel overseas to join FBI . Thomas is one of three women facing federal terror charges this week .