CHARLESTON, W.Va. — The bodies of all 29 West Virginia coal miners killed in an explosion last week have been recovered from the mine, a spokeswoman for the state mine office said today.

Jama Jarrett said the last bodies were taken out around 2 a.m. or 3 a.m. today and the bodies were being sent to the state medical examiner for autopsies.

Recovery efforts had been stalled in previous days by volatile gases, but teams entered Monday after the tunnels were ventilated.

The recovery of the remaining bodies, paves the way for federal investigators to enter the mine as they try to determine what caused the worst U.S. coal mining disaster since 1970. Investigators had not yet entered the mine early Tuesday, Jarrett said.

The team of inspectors from the Mine Safety and Health Administration briefed Secretary of Labor Hilda Solis and MSHA director Joe Main at the Upper Big Branch mine Monday.

The mine's owner, Richmond, Va.-based Massey Energy, has been under scrutiny for a string of safety violations at the mine, though CEO Don Blankenship has defended the company's record and disputed accusations that he puts profits ahead of safety.

Authorities have said high methane levels may have played a role in the disaster. Massey has been repeatedly cited and fined for problems with the system that vents methane and for allowing combustible dust to build up.

Mourning continued Monday with a ceremony at the state Capitol and a moment of silence at 3:30 p.m.