The parents of Ethan Crumbley, the Michigan teen who shot dead  four students at his high school have been charged with involuntary manslaughter, as prosecutors say the pair could have stopped the shooting.

They were arrested after an extensive manhunt, launched on Friday after the Crumbleys failed to attend their original arraignment. 

Police said the Crumbleys were caught hiding in a commercial building.

Ethan Crumbley, 15, is alleged to have emerged from a bathroom with a gun and shot students in a hallway. 

He is charged as an adult with murder, terrorism and other crimes.

U.S correspondent Nick Harper spoke to Susie Ferguson.