Authorities have released the names of two people killed in a helicopter crash in a Twin Cities suburb last week.

The Midwest Medical Examiner's Office on Monday identified the victims as 48-year-old Matthew Hayes and his passenger, 47-year-old Deborah Smith.

The Anoka County Sheriff's Office has said Hayes was from Minneapolis and Smith was from Blaine.

Sheriff's officials say the helicopter apparently broke apart as it fell from the sky before crashing and bursting into flames in a sod field in Lino Lakes on Thursday.

Officials say the amount of debris scattered over several hundred yards suggested the helicopter was breaking apart as it descended.

No one on the ground was hurt.

The National Transportation Safety Board is investigating.