Irish Prime Minister Leo Varadkar on Friday said it was safe to return to Dublin city centre after police made 34 arrests following overnight rioting that was triggered by the stabbing of three young children in the street.

Irish police have warned that further violence could follow after rioters smashed shop windows, set fire to police cars, buses and a tram, and clashed with officers in violence rarely seen in the Irish capital.

The government is also reviewing security around parliament after a recent protest trapped lawmakers inside.