From the outset of the investigation on the recent Chattanooga, Tenn. shooting, authorities have insisted that the shooter, Mohammad Youssef Abdulazeez, was a “homegrown violent extremist” without ties to ISIS or other terrorist groups. On radio, Buck Sexton interviewed investigative journalist Paul Sperry, who pointed out an important detail revealing quite the opposite.

According to property records, the mosque Abdulazeez and his family attended for years is affiliated with the same Islamic group as the mosques frequented by the Boston Marathon bombers and the 9/11 hijackers who attacked the Pentagon. Abdulazeez’s attack, which he carried out on a U.S. military base on July 16th, resulted in the deaths of four U.S. Marines and one U.S. Navy sailor.

“They all tie back to the same trustee for the marathon bomber’s mosque as it happens in Boston and the 9/11 mosque in Virginia,” Sperry said. “And by the way, also the Phoenix mosque, where the two ISIS terrorists attacked the Dallas event.”

The trustee is called the North American Islamic Trust, otherwise known as NAIT, Sperry said. In 2007, the Justice Department designated NAIT as an unindicted co-conspirator in the largest terrorist financing case in America history, US v. Holy Land Land Foundation, resulting in convictions and imprisonment of several U.S. based Hamas terrorist leaders.

Buck concluded this just adds to the evidence this attack was part of a broader ideological agenda.

“It’s clearly jihadist in nature,” he said.

Paul Sperry is the author of Infiltration: How Muslim Spies and Subversives have Penetrated Washington.

Watch a clip of the interview below: