Police say the fatal double stabbing which took place in Birmingham city centre around 6.00pm this evening has "potentially hundreds of witnesses".
Two men who are both thought to be in their 40s, were pronounced dead at the scene after police 'flooded' the area around Martineau Place and Union Street.
One of the victims is believed to have been stabbed outside Martineau Place's Sainsbury's store and the other was found 'slumped' near Boots in Union Street having suffered fatal injuries.
Police say there are potentially hundreds of witnesses as the stabbing happened at a time when the area was busy with shoppers and workers.
One man has been arrested in New Street in connection with the stabbings near to the Odeon cinema minutes later.