Fire chiefs issue warning that overheating laptops can cause fires

http://www.harrogate-news.co.uk/2012/02/24/fire-chiefs-issue...

Laptop fire blamed for Vancouver death

http://www.cbc.ca/news/canada/british-columbia/story/2009/08...

Laptop overheats, starts fire that destroys west St. Louis County home

http://www.kmov.com/news/local/Firefighters-battling-blaze-a...

Israel Police: Fatal fire in family home likely caused by overheated laptop

http://www.haaretz.com/news/national/israel-police-fatal-fir...

etc...

etc...

Lithium ion batteries do overheat and burst into flames. However, it's generally due to faulty charge controllers pumping too much current through the cells. It won't be caused by having the laptop power on in a backpack.

http://www.youtube.com/watch?v=ixIOEPnsgbI