US allies, especially in Europe, are ignoring tools that US officials have given them to track potential terrorists, the head of the FBI's Terrorist Screening Center said Thursday. "It's concerning that our partners don't use all of our data," said Director Christopher Piehota, interviewed on CNN. "We provide them with tools. We provide them with support, and I would find it concerning that they don't use these tools to help screen for their own aviation security, maritime security, border screening, visas, things like that for travel," Piehota said.