After months of speculation, the U.S. government has begun investigating how the Islamic State has acquired the hundreds of Toyota pickup trucks which are featured in the group’s propaganda videos. ABC News reports that Lukman Faily, the Iraqi Ambassador to the United States, statedthe Iraqi government believes ISIS has not only re-purposed older trucks but also has obtained “brand new” Toyota trucks in recent years.

“This is a question we’ve been asking our neighbors,” Faily said. “How could these brand new trucks… these four-wheel drives, hundreds of them — where are they coming from?”