Orlando nightclub gunman's father speaks of grief

The father of a gunman who attacked an Orlando gay club says he did not know that his son had "hatred in his heart".

Omar Mateen killed 49 people and wounded 53 more in the deadliest mass shooting in recent US history, before being shot dead by police.

Seddique Mateen said he did not understand why his son carried out the shooting at the Pulse nightclub