January 17, 2014 3:50 am Market Analysis: ‘Knightmare' on Wall Street Kim Harris explains why stocks dropped Thursday, what you need to know about Knight Capital Group and more US & World Videos 1:32 Amber Alert for 2 NH girls canceled, father in custody 2:53 Latest on Lewiston, Maine shootings 2:01 Local researchers looking to turn plastic into fuel 1:45 Gov. Healey to sign bottle ban order for state agencies 2:41 Leominster students return to school after floods