Dublin Fire Brigade said firefighters continued to damp down a smoldering tram on O’Connell Street on Friday morning and make the scene safe. Public transport resumed, but with restrictions in the area.

Barricades were still up across some streets and police stood guard outside a Foot Locker store with broken windows that was looted during the riot. The front of a Holiday Inn hotel that was also targeted was boarded up.

A five-year-old girl was receiving emergency treatment after sustaining serious injuries in the stabbing. A man in his late 40s, also being treated for serious injuries, was arrested by police who said they were not looking for any other suspect.

Police said on Thursday that they have not ruled out any motive, including whether it could be terror-related. They would not comment on the nationality of the detained man.

Such rioting is almost unprecedented in Dublin.

There are no far-right parties or politicians elected to parliament, but small anti-immigrant protests have grown in the last year. The government is reviewing security around parliament after a recent protest trapped lawmakers inside.

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A five-year-old girl was receiving emergency treatment after sustaining serious injuries in the stabbing. A man in his late 40s, also being treated for serious injuries, was arrested by police who said they are not looking for any other suspect.

Police said it appeared the man attacked a number of people on Dublin’s Parnell Square shortly after 1:30 p.m. local time (8:30 a.m. ET). Members of the public intervened at an early stage of the attack.

A woman in her 30s was also being treated for serious injuries while the two other children, a five-year-old boy and six-year-old girl, suffered less serious injuries. The boy has been discharged from hospital.

“There was complete and utter pandemonium, women wailing, men screaming and crying,” Anthony Boyle, 31, an IT consultant who lives on the road and was passing by told Reuters.

The scene was still sealed off when a group of around 50 anti-immigrant protesters briefly broke through a police barrier. Some shouted “get them out” and one kicked the wing mirror off a police car. Another was draped in an Irish flag.

A larger crowd then began throwing objects and firing fireworks at riot police in helmets and shields, once they were deployed, and the rioting spiraled out of control. The crowds began to disperse around 9 p.m. local time (4 p.m. ET.)