Many companies are training employees to deal with suspicious packages or substances.
An airport police spokeswoman said "a suspicious package" was found.
And since the London bombings, reports of suspicious packages have increased.
On April 16, 2013, the central terminal was evacuated because of a suspicious package.
Law enforcement officials said they have also been getting an increased number of calls about suspicious packages, and bomb threats.
Alert others in the area about the suspicious package or envelope.
Earlier in the week, lawmakers had been told to be alert for suspicious packages.
The inquiry began when a suspicious package was delivered to her Connecticut home several months ago.
The next thing they ask, quite rightly, is: How did that suspicious package get there in the first place?
A suspicious package was removed from the Capitol, but turned out to be harmless.