Kabul ? A civilian helicopter ferrying humanitarian aid was shot down in a southern Afghan province where fighting with the Taliban is raging, killing all six Ukrainian crew members and a child on the ground, officials said. Three U.S. service members and an Italian soldier died in the latest clashes.

The transport helicopter crashed in flames Tuesday in the Sangin district of Helmand province, the center of Afghanistan’s opium poppy cultivation where thousands of Marines are conducting their biggest offensive since the hardline Islamic movement was ousted from power in 2001.

NATO officials in Kabul said the cause of the crash was under investigation and gave no further details.