Kenya stole the show on Day Four of the IAAF World Athletics Championships in Beijing with David Rudisha returning to form to win the 800m in 1:45.84 while his unheralded compatriot, Nicholas Bett, surprisingly captured the 400m hurdles title in 47.79 seconds.

A gunman wearing a bulletproof vest and "lying in wait" killed three officers responding to a domestic disturbance call, turning a quiet street into a battlefield.

A man opened fire on police officers responding to a domestic disturbance call in Pittsburgh, US, killing three of them, according to police department official.