The uncorroborated plan does seem fishy; OTOH, something else might be up, altogether....and they're just not disagreeing with what the rumors are. Who knows?
"From America's newsroom, I'm Dari Alexander. The FBI warning Boston area police to be on the lookout for four terror suspects. They got an uncorroborated tip that four Chinese nationals may have entered the U.S. from Mexico, and are headed to Boston."