It was to be a peaceful May Day workers' and immigrants' rally in LA's MacArthur Park. Instead, the LA Police Department's Metro Division is facing ever-increasing criticism for its caught-on-video excessive use of force.

And while law enforcement officers and injured civilians are never a winning combination, the mix becomes even more complicated when credentialed members of the media are among the wounded.

According to video footage and firsthand reports, riot gear-clad police officers responded to an attack of plastic bottles ...