Three US police officers killed in Baton Rouge shooting

- Three US police officers have been killed and three others were wounded in Baton Rouge, Louisiana.
- One suspect has been killed.
- An eyewitness has said that one suspect is heavily armed.
- Law enforcement officials believe two others might still be at large.
- US President Barack Obama said he condemns the attack.
Republican presidential hopeful Donald Trump has said a "lack of leadership" was to blame for the shootings.