A District Court judge on Friday halted, at least temporarily, the impending layoffs of almost 40 North Las Vegas Police officers. The 90-day injunction was in response to the city’s plan to reduce its police force to shore up its dire financial situation. Dozens of union officers received pink slips last month. Layoffs officially were to begin today, but the North Las Vegas Police Officers Association sued the city, asking a judge to intervene. The case has been in front of District Judge Nancy Allf, who today issued the preliminary injunction.