Muncie police are searching for a woman who disappeared after leaving work Monday morning. Kimberly Nelson, 40, was last seen at about 6:30 a.m. leaving the Youth Opportunity Center in a tan four-door Pontiac Sunfire. The vehicle was found abandoned in McCulloch Park near the White River. Police and fire crews began searching the river Thursday morning. Nelson left her two children, ages 1 and 13, at home with her boyfriend when she went to work. Police say her credit cards haven’t been used and she doesn’t have a cell phone.