Father of Pennsylvania shooting victim vows to remain 'strong'
In short:
Mourners have left tributes outside a Pennsylvania home where police say a 45-year-old grandfather shot dead eight people, including children and a pregnant woman.
The father of a one-year-old victim said he was struggling to come to terms with what had happened.
What's next?
Investigators will talk to relatives and examine the mobile phones of two women who were killed outside the home for evidence.



