Cougar kills mountain biker and injures another in Washington state

• Mountain lion tracked and killed after attack in backwoods
• Second biker called 911 and shouted: 'Can you hear me? Help!'

A mountain lion killed one mountain biker and mauled another in Washington state on Saturday when they rode into its territory. State officials later tracked the animal and shot it dead, police said.

The mountain bikers were riding together down a remote, backwoods trail at 11am local time in an area near North Bend, Washington state, around 30 miles (48km) east of Seattle, when the they encountered the animal.