KANSAS CITY, Kan. (AP) — A 20-year-old man has been charged with planning a suicide bomb attack against the Fort Riley military base in Kansas, in an alleged plot to support the Islamic State group, federal prosecutors said Friday.

John T. Booker, of Topeka, was arrested Friday morning while trying to arm what he thought what a 1,000-pound bomb inside a van near the base, according to court documents. Prosecutors allege that he first met with an undercover FBI agent in October and expressed desire to engage in violent jihad on behalf of the terrorist group.

The two met several times over the next several months, with Booker discussing ideas for killing Americans, according to the criminal complaint, which states that Booker told the informant that the act was permitted by because the Quran “says to kill your enemies wherever they are.”

Booker is charged with attempting to use a weapon of mass destruction, attempting to damage property by means of an explosive, and attempting to provide material support to the terrorist group. Court documents didn’t show that he had an attorney.

The FBI said there was no breach at Fort Riley, which is about 100 miles west of Kansas City.

The FBI has focused attention in the last year on individuals who profess allegiance to the Islamic State and who either make plans to fight alongside jihadists in Syria or commit acts of violence in the United States.

U.S. Attorney Barry Grissom said Booker was arrested near Manhattan, a city that borders the base.

“We face a continued threat from individuals within our own borders who may be motivated by a variety of reasons,” Grissom said. “Anyone who tries to harm this nation and its people will be brought to justice.”

___

Associated Press writers Bill Draper in Kansas City and Roxana Hegeman in Wichita contributed to this report.