What is to blame for violent school shootings in US?

US President Barack Obama has met senior officials to discuss how to respond to Friday's school shootings in Newtown, Connecticut, in which 20 children and six adults died.

It is thought the president is in favour of re-imposing a ban on assault rifles.

Dr Kris Mohandie, who is in charge of trying to prevent school shootings in Los Angeles spoke to BBC Radio 5 live Breakfast.