The United States said it was up to Afghan security forces to defend the country after Taliban militants captured a sixth provincial capital, along with border towns and trade routes. #News #Reuters #Afghanistan #Taliban #UnitedStates #military Subscribe: http://smarturl.it/reuterssubscribe Reuters brings you the latest business, finance and breaking news video from around the globe. Our reputation for accuracy and impartiality is unparalleled. Get the latest news on: http://reuters.com/ Follow Reuters on Facebook: https://www.facebook.com/Reuters Follow Reuters on Twitter: https://twitter.com/Reuters Follow Reuters on Instagram: https://www.instagram.com/reuters/?hl=en