EC3 has published a report which states that internet-connected devices will be used for life threatening attacks. The report has been published on the Drupal EC3 website which you can find here.
The Europol report contains various chapters which I urge you to read.

It will provide you good insight in the view of Europol on internet-connected devices.
Remember Barnaby Jack? He had made a Proof of Concept which supported his warning; that he was able to deliver a fatal dose of enzyme via the diabetic insulin pump. He was able to do this by simply using internet-connected devices.
Medical Devices Vulnerable to Hack Attacks | http://www.nbcchicago.com/investigations/Medical-Devices-Vulnerable-to-Hack-Attacks-277538441.html |
Citizen Hackers Tinker With Medical Devices | http://online.wsj.com/articles/citizen-hackers-concoct-upgrades-for-medical-devices-1411762843 |
FDA sets guidelines for medical devices’ cybersecurity | http://www.usatoday.com/story/tech/2014/10/01/fda-medical-devices-cybersecurity/16543731/ |
How to Hack Your Own Medical Device | http://www.mddionline.com/article/how-hack-your-own-medical-device-09-15-2014 |
Will first ‘online murder’ take place before the end of 2014? | http://www.theweek.co.uk/technology/60741/will-first-online-murder-take-place-before-the-end-of-2014 |
$17M DoD Award Aims To Improve Clinical Trials For Traumatic Brain Injury | http://www.ucsf.edu/news/2014/10/118596/us-aims-traumatic-brain-injury-clinical-trial-success |