A wave of social media disinformation is believed to have played a large part in the deadly rush of tens of thousands of men, women and children into Spain's north African territory, after a rumor that the Ceuta border was open spread on social media.

"Platforms must act decisively in keeping the integrity of the digital space, in particular during crisis situations," said Henna Virkkunen, commissioner for tech sovereignty, security and democracy.

"Monitoring must increase, cooperation with fact-checkers to be strengthened," said Virkkunen, adding the EU would be "following up on Monday."

The Meta office sign in Brussels, Belgium, in December 2022. Photo by Reuters

Spain moved swiftly to send people back from Ceuta, announcing Tuesday that of 72,000 people who entered the enclave from Morocco on July 30-31, all but 2,000 had returned. Spanish authorities said 80 people died in the crossings.