Early Start with John Berman & Christine Romans

Breaking News: 7 troops killed in 2 Afghan. attacks

Breaking news this morning out of Afghanistan – A man wearing an Afghan military uniform opened fire on U.S. troops killing three soldiers in the country's southern Helmand province.

On Wednesday there was another deadly attack where a suicide bomb attack in eastern Afghanistan left four Americans dead, including an aid worker and senior members of an army brigade. 

– CNN's Chris Lawrence reports