Metro BRIEFINGS

MARTIN TARGETS GUNS: Chicago Police Supt. LeRoy Martin used an FBIstudy of murder in seven cities to call once again for tough guncontrol laws. The FBI reported Sunday that Chicago and six othercities recorded more than one-fourth of the nation's murders in 1990.Heading the list was New York, followed by Los Angeles, Chicago,Houston, Philadelphia and Washington, D.C. "The cities will suffer"until there is federal firearms control, Martin said. Story on Page1. OVERTIME COSTS SOAR: The Chicago Board of Education paid anestimated $4.8 million in overtime for maintenance staff in thefiscal year that ended in September. In a two-week period inOctober, 1989, 1,804 school engineers, …