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What may be a Flight 8501 window panel has been found, Singapore ministry says Thirty bodies have been recovered, officials say, and four of them have been identified Officials are focusing the search on a "most probable area" in the Java Sea

Searchers looking for more bodies and wreckage from AirAsia Flight QZ8501 continue to be hindered by tough weather conditions.

Ships, planes and helicopters are being used to try to find victims of the disaster. Most of the people on board the flight remain missing, and search teams are still looking for the main wreckage of the plane.

Efforts are being concentrated in a zone covering 1,575 square nautical miles (5,400 square kilometers) that officials believe is the "most probable area" to find the remains of the aircraft.

But on Friday, waves in the Java Sea as high as four meters (13 feet) were making it hard for divers search underwater.

The weather is "the biggest obstacle," said Bambang Hermanu, chief of police in Indonesia's Central Kalimantan province, where much of the search operation is based.