Police swooped on a machete carrying man Friday afternoon, as thousands of fans gathered nearby for a Justin Bieber concert due to take place at the Principality Stadium in Cardiff.

Officers arrested the man, who was found to be carrying a foot-long blade on Penarth Road. According to reports some 40,000 individuals are expected to turn out for the Justin Bieber concert in the city this evening.

The Daily Telegraph reports the remarks of one witness, who said of the arrest:

“I walked past as there was lots of screaming and shouting as the police were there. I saw a guy get arrested and the police officer hold the knife – it was massive.

“It’s terrifying to think something like this could happen with so many people in town. It was very scary after what happened at the Ariana Grande concert.”

A spokesman for Welsh police said two individuals had been arrested over a “motoring dispute”.

The police alert comes weeks after 22 concert goers at a performance of fellow children’s entertainer Ariana Grande were killed in an Islamist bombing in Manchester.