“The Thames is Britain’s best-known river, immortalized in the novels of Charles Dickens, and a waterway once so putrid that it shut Parliament because of its stench. It’s now getting the Olympics treatment because of its potential to give would-be terrorists a foothold.

“There’s no specific threat, but we would be failing in our duty if we didn’t consider it,” national Olympics security coordinator Chris Allison said. He said forces were testing methods used to make vessels stop and practicing boarding-at-sea procedures.”

(Source: The Thames: Potential security threat to Olympics – Olympics – ESPN.)