Divers have found the second black box from the AirAsia plane that crashed more than two weeks ago, but they have not yet been able to free it from debris on the floor of the Java Sea.

Suryadi Bambang Supriyadi, the operation co-ordinator at the National Search and Rescue Agency, said the cockpit voice recorder was located today just hours after officials announced the data flight recorder had been brought to the surface.

He said it is stuck under heavy wreckage, and divers are working to lift it.

Searchers began zeroing in on the sites a day earlier after three Indonesian ships picked up intense pings from the area.

The two instruments are vital to understanding what brought Flight 8501 down on December 28, killing all 162 people on board.

Earlier, Henry Bambang Soelistyo, chief of Indonesia's search and rescue agency, said the flight data recorder had been brought to the surface by four divers.

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