Human remains were found in two of four vehicles taken from the wreckage of the Interstate 35W bridge collapse since Wednesday evening, officials said Thursday.

The Hennepin County Sheriff's Office said in a news release that the first remains were found a vehicle recovered about 8:20 p.m. Wednesday. The second set of remains were found about 3:30 a.m. Thursday.

All the vehicles were taken from the Mississippi River bottom, the release said.

The Hennepin County Medical Examiner's office was working to identify the remains and notify their families.

The bridge collapsed Aug. 1. Officials have released the identities of nine people killed in the crash. Before the latest recovery of remains, four people were listed as missing.