SAN FRANCISCO (CBS SF) — Investigators from the National Transportation Safety Board were at San Francisco International Airport Sunday morning, sifting through the wreckage of Asiana Airlines Flight 214 that crashed on Saturday.

NTSB officials have recovered the airplane’s flight data recorder and cockpit recorder and sent the devices to Washington, D.C. for analysis.

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Continuing Coverage of Asiana Flight 214 | Listen LIVE: KCBS Coverage | Photo Gallery: Plane Crash at SFO

NTSB Chairwoman Deborah Hersman said investigators will be trying to evaluate “the human side” of the crash — pilot interaction and performance — as well as conditions at the airport and the airplane itself.

“We’re going to be looking at the aircraft and certainly looking at the airport and doing documentation as far as the airport and the environment goes,” Hersman said.

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Hersman said that it could be up to a week before the actual remains of the aircraft could be removed from SFO’s airfield.

Two of four runways at SFO remained closed today and there were no immediate plans to reopen them, airport spokesman Doug Yakel said.

Dozens of flights were being cancelled or rerouted through other regional airports.

Travelers flying through SFO were being advised to check with individual airlines to get the most updated information about flight times and cancellations.

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