The Islamic State jihadist group has claimed responsibility for an attack on Tunisia's national museum that killed at least 21 people.
In an audio message posted online on Thursday, IS said "two knights from the Islamic State ... heavily armed with automatic weapons and grenades, targeted the Bardo Museum".
It threatened more attacks, saying: "What you have seen is only the start."
Twenty foreigners were among those killed when gunmen in military uniforms opened fire at visitors Wednesday as they got off a bus and then chased them inside the museum.
They included tourists from Australia, Japan, Spain, Colombia, Britain, Belgium, France, Poland and Italy, according to the Tunisian authorities.
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