SPRINGFIELD — Police say a man on the run from officers in Massachusetts accidentally jumped into an undercover car to escape.The Republican reports police began pursuing the 25-year-old man around 10:10 p.m. Saturday in Springfield. A spokesman for the city's police department says the man was first in a pickup truck, then later seen running on foot.Authorities say the suspect opened the passenger door and tried to get away when a police sergeant with the department's narcotics unit pulled up to the scene in an undercover car.