LONDONDERRY, N.H. — Authorities in New Hampshire say further investigation is needed into the cause and manner of death of a woman whose vehicle crashed and burst into flames on Interstate 93.

Officials say the crash happened around 12:30 p.m. Monday in Londonderry. Authorities say the vehicle was travelling south on I-93 when it crashed into trees and burst into flames.

The state Fire Marshal’s office said an autopsy concluded Tuesday, but more investigation is needed. It said the victim has not yet been positively identified, but was confirmed to be a woman.