More than 100 officers and agents and helicopters have joined the intensified search for Travis Decker, suspected of killing his three daughters in Washington state.

Travis Decker is a former member of the military who has enough wilderness survival skills to live in the woods on his own for weeks or months, the authorities said.

Washinton police have been searching for Travis Decker, 32, since he did not return his three daughters to their mother May 30.