Pakistani opposition leader Imran Khan addresses his party supporters during a rally in Peshawar on Tuesday. AP
Khan retains widespread support despite his April ousting and has staged mass rallies across the country calling for early elections and railing against the government.
His speeches frequently draw top ratings on television, with highlights trending on social media in Pakistan.
On Tuesday night, however, YouTube was down across much of the country as Khan addressed a rally in Peshawar, with London-based internet outage monitor Netblocks confirming the disruption.
"Access was restored after the speech concluded," Netblocks told AFP.
YouTube has not commented on the matter, while a representative of the Pakistan Telecoms Authority said they had "no idea about it".
Last month the government's media regulatory body banned Khan's speeches from being broadcast live, on the grounds they were inciting unrest, but this week the high court ruled the order illegal.
Still, no TV channels broadcast Tuesday's speech.
On Wednesday Khan accused the government of censoring him, saying the move would damage the country's reputation.
"They are imposing complete blackout of my speeches not only from mainstream media but also by blocking YouTube," he tweeted.
"This fascist govt of cabal of crooks & their backers are willing to harm the interests of Pakistan simply out of fear of (his party) PTI's soaring popularity. Utterly callous & unacceptable."
Supporters of Pakistani opposition leader Imran Khan’s Tehreek-e-Insaf party attend a rally in Peshawar. AP
Last month ARY News, a pro-Khan television station critical of the current government, was taken off air but a court last week also ordered the ruling illegal.
Another private TV channel, Bol News, was suspended last week — ostensibly for operating with an expired licence — and insisted later it was being "punished for showing what the government doesn't like".
Free speech campaigners have long criticised the creeping censorship and control of Pakistan's internet, printed and electronic media.
"It is digital martial law," said Usama Khilji, a digital rights activist.
Khan is due in court on Thursday for a hearing on one of a slew of cases and charges brought against him since he was booted from office by a vote of no confidence in the national assembly.
The country has a history of those in power using the police and courts to stifle their political opponents, and current premier Shehbaz Sharif also has several pending cases from when he was in opposition.
Pakistan's political crisis comes as the country grapples with the worst floods in its history, with some 33 million people affected by record monsoon rains that have left almost a third of the nation under water.
Prime Minister Imran Khan on Wednesday said that although he had “nothing to gain from politics,” he had persevered in his political struggle for 23 years to fulfil his responsibility towards the Pakistani people.
He stood briefly when his name was announced and then seated himself again before the others did in a breach of protocol.
Two main opposition parties, the Pakistan Peoples Party (PPP) and the Pakistan Muslim League-Nawaz (PML-N), have lashed out at Prime Minister Imran Khan for yet another outburst against opponents in his latest televised address to the nation.
The shooters claimed that the woman wanted to marry her cousin Waqas, brother of Abbas, who was living in Italy but her brother opposed it. According to the report, the brother wanted her sister to marry a well-educated person, but she refused.
Several infrastructure projects and emissions from nearby refineries were the possible reasons, said a government official who did not want to be named as he was not authorised to talk to the media.
"I think it's very exciting that the UAE, an OPEC member, is going to host COP28, and it's so important that you have an oil and gas producing nation step up and say we understand the challenge of the climate crisis,” Kerry told Reuters in an interview.