Pan-Arab satellite network Al Jazeera said on Thursday it had come under a large scale cyber attack.
Al Jazeera is the flagship broadcaster for Qatar, which is in a stand-off with fellow Arab states over alleged ties to terrorism, a row which is endangering stability in the region.
"Al Jazeera Media Network under cyber attack on all systems, websites & social media platforms," it said on Twitter. Reuters could not immediately validate the report.
More details are awaited.