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Comic-Con attendees freaked out after a tweet warned that United Airlines was forcing fliers to remove comic books from checked bags.

Turns out that's not really a restriction,Watch Jukkalan Online according to the TSA and the airline.

A Twitter user posted a photo Sunday showing a screen that said travelers had to remove comics from checked bags in San Diego.

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There aren't other photos backing up the Twitter user's claim, but United did tell Mashable, "We misunderstood TSA’s instructions and regret any inconvenience this may have caused our customers."

Initially, the airline responded to the tweet saying it was a restriction set forth by the TSA.

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But the TSA said nope, don't blame us.

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In their response, the TSA linked to a blog post on its site from earlier this year in which they addressed rumors about books being screened during security checks. But this was only a test, the TSA said, and travelers no longer have to remove books from bags for screening.

How did this mixup happen, you ask?

It's unclear. But The Vergepoints to a set of TSA travel tips from last year's Comic-Con that may have led to the United mishap.

The guidelines told travelers to carry comics in their carry-on, along with brochures, or magazines. But it didn't say comics hadto be removed from checked bags.

Online, people had a field day with the alleged rule.

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UPDATE July 24 5:11 p.m. PT: United told Mashable Monday evening it regrets any inconvenience to passengers.

"While TSA is recommending that customers keep their comic books in their carry-on bags, there are no restrictions on packing them in checked luggage," the company said. "We misunderstood TSA’s instructions and regret any inconvenience this may have caused our customers."