CARACAS (Reuters) - Twitter Inc has suspended more than a dozen accounts associated with Venezuela’s government and military, including the OPEC nation’s oil ministry and the armed forces’ operational command.

FILE PHOTO: People holding mobile phones are silhouetted against a backdrop projected with the Twitter logo in this illustration picture taken in Warsaw September 27, 2013. REUTERS/Kacper Pempel/Illustration

Officials criticized the move shortly after the accounts were first suspended on Tuesday, without explanation or any announcement from Twitter. Some of the accounts initially suspended, including those of the central bank and finance ministry, were later restored.

“Alert! People of Venezuela, the oppressive government of the USA blocked the Twitter account for CEOFANB and others,” military commander Remigio Ceballos wrote on Twitter, referring to the Bolivarian Armed Forces’ Strategic Operational command.

Twitter in a statement Wednesday said the service has “proactive systems” which aim to detect “platform manipulations,” but that such systems can commit errors which account owners are welcome to appeal.

The company, which offered no further comment on the Venezuelan matter, often discloses takedowns of information operations that seek to manipulate its platform.

In December, Twitter suspended tens of thousands of accounts linked to a Saudi company digging up political dissidents’ personal data, and in September it blocked the account of Cuban Communist Party leader Raul Castro.

It also announced three separate removals of Venezuelan accounts last year, two in January and one in June, representing a total of nearly 2,000 accounts, some of them part of “a state-backed influence campaign targeting domestic audiences.”

While Twitter initially suspected the removed Venezuelan accounts were associated with Russia’s Internet Research Agency, in June it said it had new indications they were being operated by “a commercial entity originating in Venezuela.”

Social media companies globally are under pressure to stem illicit online political influence campaigns.

Twitter’s suspension of the official Venezuelan accounts came about two months after the country’s foreign ministry briefly lost access to its account with the social media service. At the time, a Twitter spokeswoman said the account was accidentally caught in a spam filter, which occasionally happens when an account tweets in sudden high volume.