LONG BEACH, Calif. — In Cologne, Germany, authorities arrested a 29-year-old Tunisian man they say was planning an attack with the deadly toxin ricin. It’s a biological weapon made from castor beans, and inhaling or ingesting just one milligram can be deadly.

In the U.S., authorities are trying to keep up with ever-changing terror threats, including possible attacks at sea.

From a hovering helicopter, a sniper takes out an enemy combatant, and an elite U.S. Coast Guard counter terrorism team swings into action, rappelling to the deck and taking command of the ship. CBS News rode along for the elaborate training exercise off the coast of southern California, where team members disguised as terrorists are mixing a deadly weapon to disperse on shore. Read more