Senior police source tells us there have been multiple injuries. The Arndale Centre is on lockdown and there is a huge police response in Manchester city centre
One man is in to have been detained and a terror probe has been launched by Police
Counter Terror officers are leading the investigation but police say they are keeping an open mind about the motivation of the ‘terrible incident.’
A man in his 40s has been arrested at the scene on suspicion of serious assault.
More to follow