The American news outlet has published a report which claims the UAE hacked Qatari government news websites in order to plant a false news story and thus create a trigger for the crisis.
This combination of file pictures created on June 5, 2017, shows (L to R) Qatar's Emir, Sheikh Tamim bin Hamad al-Thani in NY on September 20, 2016, Egyptian President Abdel Fattah al-Sisi in Cairo on March 2, 2017, Saudi King Salman in Riyadh on January 1, 2013, Prime Minister of the United Arab Emirates (UAE) and ruler of Dubai, Sheikh Mohammed bin Rashid al-Maktoum, in Riyadh on May 05, 2015 and Bahrain's King Hamad bin Issa al-Khalifa in Riyadh on May 21, 2017.
The Washington Post cited unidentified USA intelligence officials as saying they had learned last week of newly analysed information showing that top UAE officials had discussed the planned hacks on May 23, the day before they occurred.
The four states - the UAE, Saudi Arabia, Egypt and Bahrain - imposed sanctions on Qatar on 5 June, cutting diplomatic and transport ties with the tiny Gulf monarchy, after accusing it of financing militant groups and allying with their regional arch-foe Iran.
However, the officials are unclear whether the UAE carried out the hacks itself or contracted to have them done. When did Trump and Tillerson learn about alleged UAE involvement in the hacks?
Lazio, Biglia al Milan. L'agente: "Non vede l'ora di iniziare!"
Con indosso la divisa rossonera, a Biglia sono stati chiesi i primi autografi da rossonero. In Italia arriva alla Lazio nel luglio 2013 ed esordendo in Serie A il 25 agosto.
Qatar says it believes the Washington Post report, saying it "unequivocally proves that this hacking crime took place".
The incident helped spark a diplomatic rift between Qatar and its neighbours. Funding, supporting, and enabling extremists from the Taliban to Hamas and Gaddafi. The bogus remarks were reported by Saudi-supporting media.
Anwar Gargash, the UAE Minister of State for Foreign Affairs, also said the accusation the UAE hacked Qatar was "purely not true".
Qatar has for years parlayed its enormous gas wealth and Al Jazeera's reach into broad influence in the region, and in 2011 supported "Arab Spring" revolts across the Middle East.
USA investigators have been working in Doha to help the Qatari government investigate the alleged hack, according to Qatari and USA government officials.
"What we know now is that Qatar is admitting that the list is worthy, that the list needs to be looked at, and that they need to change some of their laws to ensure that there is a proper process to cover this list", he said.