L.A. Now Live: Discuss L.A. Artwalk and LAPD skirmish

Los Angeles Times reporters Andrew Blankstein, Armand Emamdjomeh and Melissa Leu will join City Editor Shelby Grad to discuss the L.A. Artwalk and the skirmish between police and protesters.

The chat is scheduled for 9 a.m. Friday. Questions can be submitted live during the discussion.

In all, police arrested 19 people after several hours of clashes with protesters. Four officers were hurt and treated for minor injuries in the Thursday night incidents. One officer suffered a minor concussion after being hit in the head by an object thrown by the crowd, police sources said.

Protesters also tweeted photos of at least one man who suffered injuries from a rubber bullet.

Occupy L.A. protesters said they were at ArtWalk showing support for people previously arrested for chalking on the sidewalk. A Facebook event advertised the planned demonstration, apparently named "Chalk Walk."