Head of the Association of Chief Police Officers, Chief Constable Andy Trotter has said threatening messages sent via Twitter are "disgraceful" and will be taken seriously by police:
More top news
Researchers in Boston have created a 'robot cheetah' that they hope will be able to reach top speeds of 30mph.
UK trials of a vaccine for the Ebola virus began today - but some experts complain that the response has been a long time coming.
This September has been the driest so far for more than 50 years, Met Office figures have revealed.