SANTA ANA (CBSLA.com) — Santa Ana police Thursday conducted a two-hour crackdown on motorists who failed to yield to pedestrians.

Police issued 54 citations to drivers at Main and 15th streets and 33 at Main and Walnut streets between 8 and 10 a.m.

READ MORE: Rain, Hail Fall On Parts Of Orange County

The tickets were issued when motorists did not yield to undercover officers who were crossing the street at crosswalks, officials said.

READ MORE: Crews Working To Contain Brush Fire Burning In Whittier Narrows Area

The crackdown was prompted after an 11-year-old girl was killed while crossing the street on the morning of July 24.

Alex Zuniga was struck and killed at Bristol Street near 10th Street. Her 8-year-old brother was hit and hospitalized in critical condition.

MORE NEWS: CDC Reverses Advisory Panel Recommendation, Includes High-Risk Workers In Booster Shot Eligibility

(©2013 CBS Local Media, a division of CBS Radio Inc. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. Wire services contributed to this report.)