Sorry, this is a bit long. But, it shows an important point.
Initial reporting, in an effort to be “first”, is often inaccurate

Baltimore officer shot while responding to a carjacking suffered a significant injury to his wrist, police say. https://t.co/U6zlqO22Ry

— The Baltimore Sun (@baltimoresun) October 13, 2016

New: @BaltimorePolice say officer shot last night in Cherry Hill was hit by accidental gunfire from own weapon.

— Justin Fenton (@justin_fenton) October 13, 2016

Last night police said carjacking suspects opened fire and police did not fire any shots. Now: only shot fired by officer himself

— Justin Fenton (@justin_fenton) October 13, 2016