OKLAHOMA CITY (KFOR) - McIntyre Law Chopper 4 is headed to the scene of a semi-truck accident in Northwest Oklahoma City. Semi-truck accident in NW OKC, Image courtesy McIntyre Law Chopper 4 Authorities say the semi-truck has pulled down several power lines on Northwest 36 & Portland causing traffic delays on Portland. Portland in this area is closed. No further information has been released. This story is developing.