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After she gave him water, she said the suspect pulled out a keffiyeh and yelled "free Palestine".

After police arrived, Mr Kalin said the suspect confessed to the shooting and "pulled out a red keffiyeh".

Video posted on social media showed chanting protesters entering the library, many wearing keffiyeh headscarves and masks, defying a ban imposed by the Trump administration.

US filmmaker Ben Russell, who was there and wore a Palestinian keffiyeh scarf, said he stood against "genocide" in Gaza.

In the Netherlands, police deployed batons and tear gas on pro-Palestinian protestors, while in Canada it is now forbidden to wear a keffiyeh in Ontario’s legislative assembly.