Memorial service held for slain Dallas officers

At a memorial for slain police officers, President Barack Obama declared Tuesday that a week of deeply troubling violence has seemed to expose "the deepest fault lines of our democracy." But he insisted the nation is not as divided as it seems and called on Americans to find common ground in support of racial equity and justice.Obama acknowledged that Americans are unsettled by another mass shooting and are seeking answers to the violence that has sparked protests in cities and highlighted the n