Steve Kerr, coach of NBA side Golden State Warriors, has launched an attack on US politicians, the National Rifle Association (NRA) and the Donald Trump's plans to build a wall between America and Mexico hours after another fatal mass shooting. Kerr said "nothing has been done" when asked about the tragic shooting which has left at least 17 dead at a school in Florida, including students and teachers. The shooting is the deadliest school attack since 26 people were killed at Sandy Hook school in Connecticut in 2012 and is the sixth school shooting that has either wounded or killed students already this year.