The chief executive of UnitedHealthcare ... said the shooter appeared to be a man who was wearing a black face mask, black and white sneakers and a “very distinctive” gray backpack.

The police unfurled a massive manhunt in Manhattan on Wednesday for a gunman they said shot and killed the chief executive of UnitedHealthcare ... a black face mask, black and white ...

UnitedHealthcare has more than 18,000 employees ... The photos show what appears to be a white man in a hooded jacket with a backpack and a covering obscuring the bottom half of his face.