UPDATED 10:55 a.m. PT with information from Delta.

Abandon all devices bigger than a smartphone, ye who board here.

We just got our first look at an airline warning passengers that they cannot bring laptops, tablets, or e-readers in their carry-on bags.

This:

Breaking: #ElectronicsBan: @Delta are displaying info at airport "Effective May 12, Cell phones ONLY onboard flights to United States" pic.twitter.com/Uwo4UOPyzQ — Alex Macheras (@AlexInAir) May 12, 2017

The picture quickly caught the attention of the media. A Delta spokesman said the sign was put up in error at the Cincinnati International Airport and has since been removed. He said a Delta employee posted the sign after "information was communicated in error."

.@Delta tells @ABC: The sign was posted in error and has been taken down. https://t.co/EZrfAkQJ3v — Dan Linden (@DanLinden) May 12, 2017

Reports of a broader ban on electronics aboard international flights emerged earlier this week. We're still not positive how far the ban extends, but initial stories said the rules — originally put in place for eight Middle Eastern and African countries — would be extended to parts of Europe.

The U.S. Department of Homeland Security press secretary David Lapan said in an email that "no decisions have been made on expanding the restriction on large electronic devices in aircraft cabins," but conceded that it is "under consideration." He went on to say that "when there are changes, we’ll announce that." He said there will be no announcements Friday, "contrary to some published reports."

Check w/ @Delta on the sign but DHS has NOT made a decision on expanding the restrictions on large electronic devices from selected airports — David Lapan (@SpoxDHS) May 12, 2017

The initial ban also saw a company post the ban too early, with Jordanian Airlines tweeting out a statement before the ban went into effect.

The sign above mirrors what many media outlets had previously reported — that the new ban will go beyond laptops to include tablets and any other electronics of a similar size. That leaves very few options for travelers.

Recent bans on laptops have been tied to terrorism concerns. However, these bans have not prevented travelers from checking bags containing laptops, causing some confusion. One reason for this practice is that the screening process for carry-on luggage may not be enough to detect some explosives.

U.S. authorities put the previous ban in place in late March.

Sasha Lekach contributed reporting.