Carl Levin, D-Michigan, said one of his home-state offices received a "suspicious-looking" letter and alerted authorities.

CNN: Feds: Mississippi man arrested in ricin scare

Carl Levin, D-Michigan, says one of his home-state offices received a "suspicious-looking" letter and alerted authorities.

CNN: Ricin scare rattles Washington

Soon afterward, Wang sighted suspicious-looking "Sony" earphones at the Longfu Department Store.

CNN: A Profitable Crusade

Authorities urged citizens to report any suspicious activity or behavior in the days and weeks ahead to but refrain from reporting suspicious-looking people.

CNN: U.S. anticipates al Qaeda 'threats of retaliation'

Some 18 months ago, Ali Reza Rajai, a religious nationalist, was unexpectedly returned in parliamentary elections (though squeezed out by a suspicious-looking recount).

ECONOMIST: Iranian liberals on trial

After all, savvy users would balk at giving their cell phone details in the first place, not to mention downloading a suspicious-looking application to their handsets.

FORBES: BlackBerry, Nokia Malware Aims To Defeat Banks' Security Scheme

DeGeorge told officials he suspected the explosion was caused either by "hit men" working for the opposite side in a hotly disputed case he was litigating--a "suspicious-looking fishing boat" had circled his yacht, he said--or by the negligence of a repairman who left flammable material near a stove.

FORBES: Companies, People, Ideas