“Al-Qaeda’s online communications have been temporarily crippled, and it does not have a single trusted distribution channel available on the Internet,” Evan Kohlmann, of Flashpoint Global Partners, told NBC. Flashpoint monitors the extremist organization’s communications.

The attack happened within the past few days and was “well coordinated and involved the use of an unusual cocktail of relatively sophisticated techniques,” he said, adding that it could be several days before the network is up and running again.