Meet the vigilante who hacks jihadists

“You are hosting fajer.info… which provides material support (inc mobile apps) to #ISIS terrorists,” he warned, identifying a specific computer server.

At 9:19 p.m., Jester followed up with his signature threat: “I respectfully urge u to review my last 2 tweets. U should take action, or if you prefer, I can. #30mins #TickTock”

Half an hour later, the jihadist website was knocked offline, and Jester delivered his catchphrase: “TANGO DOWN.”

Related: Anonymous blocks jihadist website in retaliation for Charlie Hebdo attack

Most stock quote data provided by BATS. Market indices are shown in real time, except for the DJIA, which is delayed by two minutes. All times are ET. Disclaimer.

Morningstar: © 2015 Morningstar, Inc. All Rights Reserved.

Factset: FactSet Research Systems Inc. 2015. All rights reserved.

Chicago Mercantile Association: Certain market data is the property of Chicago Mercantile Exchange Inc. and its licensors. All rights reserved.

CNN Money