ISIS purportedly claimed responsibility for the Tunisia Bardo Museum massacre in an online audio recording posted on a website linked to the group, analysts said Thursday.
An unsigned statement identified the two dead attackers as "Abu Zakaria al-Tunisi" and "Abu Anas al-Tunisi" and called them "knights of the Islamic State," according to security analysts Flashpoint Intelligence.
An audio version of the claim said that the attack targeted "citizens of the Crusader countries" and that Allah had "brought terror to the hearts of the infidels."
No further details were immediately available about the unverified claim, and there was no immediate comment from Tunisian authorities.
ISIS has affiliates in neighboring Libya, where many Tunisians have gone to fight and train with extremist groups.
At least 23 people were killed in Wednesday's atrocity, including 20 foreign tourists.
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Reuters contributed to this report.
