(AP) — The National Transportation Safety Board has closed its San Francisco command post, concluding the on-scene investigation into the crash-landing of Asiana Airlines Flight 214.

The NTSB said in a statement Monday that its investigative team has completed the examination of the airplane wreckage and runway at San Francisco International Airport.

The wreckage will still be available for further examination if necessary at a secure storage location at the airport.

Investigators completed several witness interviews over the weekend and were expected to finish interviewing first responders Monday.

The agency says the next phase of the investigation will include additional interviews, examination of the evacuation slides and other airplane components, and more in-depth analysis of the airplane’s performance.

Flight 214 crashed July 6, killing three people and injuring dozens.