National Guard deployed to Philadelphia

Several hundred guardsmen will assist local agencies in "protecting life, property and the right to peacefully assemble and protest," Lt. Col. Keith Hickox said in a statement Tuesday. "We are able to conduct operations in support of civil authorities to enhance local law enforcement’s ability to provide continued public safety and critical infrastructure security."

The move by Gov. Tom Wolf, a Democrat, to activate the guard is a stark difference from other Democratic governors who have been hesitant or slow to mobilize troops in response to unfolding unrest.

The Philadelphia Police Department will also beef up its presence across the city in anticipation of possible unrest over the death of Walter Wallace Jr., 27, city leaders said.

"For today and this evening, we anticipate the chance of additional incidents of civil unrest and, as such, we will be taking additional steps to ensure order," Philadelphia Police Commissioner Danielle Outlaw said during a news conference along with Mayor Jim Kenney and city leaders.

Who was Walter Wallace Jr., the man shot by Philadelphia police?

We are learning more about Walter Wallace Jr., the man who was shot by Philadelphia police on Monday, and protesters who clashed with officers in the wake of the shooting.

Wallace was an aspiring rapper with social media accounts filled with videos.

Guns are a central theme as he rhymes about shooting people, including police.