Investigators cited by the news agency claim that Hussain is the main individual behind a Twitter account linked to the CyberCaliphate, that of "Abu Hussain al-Britani".
In 2012, Junaid Hussain was found guilty of hacking the address book of former British Prime Minister Tony Blair, and was jailed for six months. A former resident of Birmingham, he had reportedly moved to Syria at some point during the last two years. However, the investigators haven’t yet finished analyzing the technical evidence, so it remains unclear where the cyber-attack was launched from, Reuters adds.
On Monday, the US CENTCOM Twitter account was hacked by a group calling itself the CyberCaliphate claiming to be associated with IS, which is a radical Sunni group that has been active in Iraq and Syria. An hour after the incident occurred, the Twitter feed was taken offline.
IS extremists have ceased vast areas in both countries, proclaiming the establishment of an Islamic caliphate on the territories under its control and forcing thousands of people, mostly religious minorities, to flee.
In September of last year the United States launched an international coalition that has been carrying out airstrikes against IS targets.
IS has become known for its violent tactics, including public executions and beheadings of Western journalists some of which have been recorded on video and released online.