The third annual May Day march to support immigrant rights is getting underway this afternoon. Marchers will be starting from Union Park and headed to Federal Plaza in the loop. Our reporter Chip Mitchell is on the scene and will be filing updates this afternoon. Checkout his report previewing today's events and view the march route. And here are some photos from last year's march. If anyone has shots from today they are willing to share, drop them off at the Chicago Public Radio Flickr photo pool. UPDATE: Flickr user Jvoves has uploaded a bunch of shots of today's march.