City officials say the mass shooting at a block party in West Philadelphia yesterday was sparked by an argument. Three people were killed, six others injured. KYW's City Hall Bureau Chief Pat Loeb joins us with more on what the mayor and other officials are saying.

📸: NBC10 Philadelphia

<p>City officials say the mass shooting at a block party in West Philadelphia yesterday was sparked by an argument. Three people were killed, six others injured. KYW's City Hall Bureau Chief Pat Loeb joins us with more on what the mayor and other officials are saying.</p>
<p>📸: NBC10 Philadelphia</p>

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