Security at the mass transit systmes in Milwaukee is tighter following the deadly explosions in London.
While state officials say there is no credible threat to the United States, or to Wisconsin specifically, a retired Eau Claire FBI agent says all citizens must remain vigilent.
Jerry Southworth, who now lives in Colfax, says if citizens let their guard down, that's when they become predicable. It's that time, he says, that it's easy for terrorists to target society or an infrastructure.
Southworth says intelligence agencies from around the world are sharing information on a higher level than they ever have.
He says many planned attacks, unknown to the public, have been prevented. But, he believes, there may be another event at some time in the United States.