DENVER — Authorities say a 3-year-old girl died two days after being in a crash in northern Colorado that killed her mother and her brother.

Colorado State Patrol says 29-year-old Shelia Sinclair of Lochbuie and her 6-year-old son Jackson Sinclair died after a four-vehicle crash on Friday.

Several others were injured.

Colorado State Patrol says Sinclair’s daughter, Kassidy, died on Sunday.

Sinclair’s third child, 18-month-old Bella, survived the crash with a few broken bones.

KDVR-TV reports it’s not clear if weather or speed played a role in the crash.

The cause of the crash is under investigation.

Information from: KDVR-TV,