Mayoral hopeful Wendy Greuel laid out an expensive plan Tuesday to expand the ranks of the Los Angeles police and fire departments by about 20% over seven years — a goal her critics dismissed as virtually impossible given the city's current finances.

At a news conference outside the headquarters of the city firefighters' union, which has endorsed her, Greuel said she set her goal of 12,000 police officers — up from the current level of about 10,000 — based on a recommendation by former L.A. Police Chief William J. Bratton. She also promised to expand crime-prevention programs, create a "public safety trust fund" for emergencies, and improve fire and medical emergency response times, which have increased due to staff cuts during the economic downturn.

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