The U.S. military will investigate whether obstruction of justice should be added to other charges faced by two Marine pilots whose jet severed ski lift cables in Italy, killing 20 people, the Marine Corps said Saturday.

The two Marine airmen were already scheduled to be court-martialed in December and January on manslaughter and negligent homicide charges in the deaths in the Italian Alps.The latest development would open a new "Article 32" hearing, which is similar to a grand jury, to look into whether Capt. Richard Ashby and Capt. Joseph Schweitzer should be charged with obstructing justice. No date was set.