“Save time. Avoid the line,” one reads.

“Vote early. Text ‘Hillary’ to 59925,” says another.

At least four such ads began making rounds on social media this week, each containing the Clinton campaign’s “H” logo and a line saying they were “paid for by Hillary for President.” Some featured images of Clinton that appear to be pulled from actual campaign marketing materials, while others showed a black woman and a Hispanic woman, in what may be an attempt to dupe to minority voters specifically. One was written entirely in Spanish.

The ads seemed to gain traction after Twitter user @TheRickyVaughn tweeted them out along with the pro-Clinton hashtag #ImWithHer. The user, who had roughly 11,000 followers before his account was suspended, has previously tweeted conspiracy theories and racial and homophobic slurs, and regularly linked to polls favorable to Republican nominee Donald Trump.

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The same user appears to have been the source of a tweet from Texas Agriculture Commissioner Sid Miller that drew widespread criticism on Tuesday. In the now-deleted tweet, Miller, a Republican who advises Trump, referred to Clinton as an obscene word for female genitalia, as The Washington Post reported. According to the Austin American-Statesman, the tweet appears to have been copied from posts by @TheRickyVaughn. Miller said his staff inadvertently retweeted the word.

Twitter user Robert McNees, an associate professor of physics at Loyola University Chicago, was among the first to alert Twitter moderators to the vote-by-text ads, questioning whether they violated the platform’s terms of service.

In a statement, Twitter initially told him they did not.

Later, however, Twitter started removing them, and CEO Jack Dorsey told McNees the problem had been “fixed.”

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https://twitter.com/jack/status/793914791379095552

Some of the accounts that circulated the ads appear to have been suspended, but other users were still posting them on Thursday morning.

A few people reported texting “Hillary” to the number listed. When they did, they got a variation of this response, according to Mashable:

“The ad you saw was not approved by iVisionMobile OR Hillary For America in any way. To opt-in to the real HFA list, text HFA to 47246. Reply STOP to cancel.”

In another election, the ads might have been dismissed as minor mischief. But at a time when both campaigns have raised concerns about voter suppression, they stirred fears that they may have been a legitimate attempt to confuse and intimidate voters.

Republicans and Trump supporters in particular have faced mounting accusations that they are trying to prevent minority voters from casting ballots next week. In North Carolina, a key battleground state, a federal appeals court over the summer struck down a GOP-backed voter identification law, saying it sought to stifle black turnout “with almost surgical precision.” Similar laws have been passed in about a dozen other states, with opponents saying they disproportionately affect minorities.

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“Poll watching” efforts are also underway, with pro-Trump groups promising to set up hidden cameras and dispatch undercover agents in predominantly Democratic precincts, according to Politico.

And as The Washington Post’s Philip Bump reported last month, the Trump campaign is targeting young white liberals, young women and black voters with negative ads on social media. One senior campaign official characterized the effort this way in an interview with Bloomberg: “We have three major voter suppression operations underway.”