An Australian TV news correspondent was attacked as she tried to present a news bulletin from London.
Sophie Walsh was off camera when the man allegedly attacked her but her screams could be heard on the Nine News Perth bulletin.
As the news broadcast returned to Ms Walsh, she looked shaken and was watching off screen.
“I just had someone come up and try and, yeah. A man came up and grabbed me. It’s Ok, he’s not harmed. He just came up and grabbed me though.”
From Perth, the company's main news anchor made sure Ms Walsh was okay.
Nine News reported the attacker was chased by Ms Walsh's camera operator and other bystanders.
They said it was unclear whether the attacker had a weapon in his possession but he was arrested for making threats to kill and having an offensive weapon.
Ms Walsh was reporting from London on protests on Paris when the attack happened. It happened near Buckingham Palace as the Black Lives Matter event was expected to get underway at Hyde Park.
Nerves were already on edge after a car collided with two people in nearby Kensington, although police have since announced it is not believed to be a terrorist incident.
“The car was found abandoned. Cordons were put in place and buildings in the surrounding area were evacuated as a precaution while officers searched the vehicle. A man was subsequently arrested for driving offences,” police said.
An officer at the scene told The National the car incident was not connected to the protests but it was initially treating it as a suspicious vehicle.
Both incidents happened near entrances to Hyde Park.