Joe Biden and his family were dropped off in milk cartons during a visit to Ireland.
The former US president's security had to cover the politician, his wife and son with umbrellas from flying objects.
Biden came to Dublin University (Trinity College) to support his son Hunter, who received a gold medal from the university's oldest student union.
The protest was organized by pro-Palestinian activists chanting "shame and disgrace" and "Joe Genocide". The police officers present at the scene argued with the violators, used pepper spray and arrested at least two people.
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