Update: Dee Collins, the chief constable of West Yorkshire police, has confirmed that Jo Cox has died and a full investigation is underway.

A Labour MP has reportedly been left in “critical condition” after being shot twice and stabbed in Birstall, West Yorkshire.

Jo Cox – who was elected as the representative for Batley and Spen in 2015 – was left bleeding on the floor after being attacked in the street this afternoon. The police have confirmed that a 52-year-old man has been arrested in relation to the incident.

“At 12.53 today, police were called to a report of an incident on Market Street, Birstall, where a woman in her 40s had suffered serious injuries and is in a critical condition,” stated a police spokesperson. “A man in his late 40s to early 50s nearby also suffered slight injuries. Armed officers attended and a 52-year-old man was arrested in the area. There are no further details at present.”

Eyewitness accounts are currently inconsistent, though there are unconfirmed claims that the assailant shouted “Britain first” before shooting the Labour MP. As a result, both the ‘Leave’ and ‘Remain’ campaigners have called off all referendum-related events for the rest of the day.

“Utterly shocked by the news of the attack on Jo Cox,” wrote Labour leader Jeremy Corbyn, shortly after the news broke. “The thoughts of the whole Labour Party are with her and her family at this time.”