"He (Blanco) is there as a guest, we can confirm that", the official said.
The 64-year-old's auto was surrounded outside his Democratic Action Party's headquarters before it was towed, with him still inside, to the notorious Helicoide prison inside SEBIN headquarters.
Activists from the Embassy Protection Collective have been staying inside the embassy since April, with the permission of the Venezuelan Foreign Ministry.
The Constituent Assembly, which Nicolas Maduro created to sideline the National Assembly, has said it would suspend the immunity of any lawmakers who backed the uprising.
Guaido invoked the constitution to assume an interim presidency in January, arguing Maduro's 2018 reelection was illegitimate.
The United Nations says a quarter of its 30 million population are in urgent need of aid, and more than 2.7 million have fled the deprivation.
The newspaper also said Trump is not comfortable with increased escalation in Venezuela, due to the risk it poses in creating a proxy fight with Russian Federation, which arms Maduro's government. But the recent measures suggest the ruling Socialist Party is seeking to isolate him by pursuing key political allies. For the Russian Federation, even if geographically distant, Venezuela is an important geo-strategic beachhead to reaffirm its status as a great power, to stave off conflicts from its own borders and near overseas, and to annoy and distract the United States from other regions.
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The sources said discussions have been under way for months between the panel and Mr Trump Jr regarding his possible testimony. Richard Burr's decision to subpoena Donald Trump Jr .by reiterating his earlier contention that "the case is closed".
Trump raises tariffs on $200 billion of Chinese goods, prompting Chinese warning
He has also accused the Chinese government of backing away from earlier promises it made during the past months of negotiating. Concerns have grown that the protracted trade war could further roil global markets and cast a shadow over the world economy.
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Archer showed glimpses of his ability while making ODI and Twenty20 global debuts against Ireland and Pakistan last week.
Zambrano was arrested on Wednesday by agents from the SEBIN intelligence service who used a tow truck to drag away his vehicle with him inside. Authorities have not confirmed where he was being detained.
Opposition leaders and worldwide officials also condemned the arrest.
The Southern Command said in a tweet on Thursday that it was prepared to discuss "how we can support the future role" of Venezuelan armed forces leaders who "restore constitutional order", when invited by Guaido.
Guaido's chief of staff, Roberto Marrero, was arrested in March and remains in jail. "Zambrano's arrest may be a test to gauge the response of the global community before it moves against Guaido".
Maduro, recognized by China and Russian Federation among numerous other countries, has accused the United States of seeking to overthrow his government and install Guaido in a bid to get hold of Venezuela's natural resources.
"Investigations have succeeded in proving that General Manuel Ricardo Cristopher Figuera has been recruited by the Central Intelligence Agency for more than a year", Maduro said, adding that justice would be served on the "traitor" Figuera "sooner rather than later".