A 15-year-old boy was arrested for the second time today by UK detectives investigating the attempted murder of a woman jogger in a park.

Two men were freed on police bail tonight after being arrested over the murder of an American jogger and the stabbing of another woman in London parks.

The heroine doctor who saved a female jogger’s life after she was stabbed feared for her safety while treating the runner, it emerged today.

A knife-wielding maniac who murdered a jogger as she ran through a park has struck again, police fear.