Two floors of The Wall Street Journal’s lower Manhattan headquarters were evacuated Wednesday after the discovery of at least 13 suspicious envelopes containing white powder.

At least four envelopes were opened and others were left unopened in the mailroom Wednesday, police said. The Journal said it had received more than a dozen envelopes containing the substance.

The mail was addressed to several New York-based executives at the newspaper. At least 10 of the envelopes were being held in the mailroom of the Journal’s Lower Manhattan headquarters. The evacuated floor is shared by newspaper executives and editorial page employees. The return address was Knoxville, Tenn.

The powder is being tested, and those who came into contact with it have been isolated, police said. Journal employees were warned via e-mail not to open their mail, the paper reported.

The Wall Street Journal is owned by News Corp., the parent company of FOX News.

 [1] http://www.foxnews.com/story/0,2933,481187,00.html