"I’ve heard of many incidents from many sources. Like we have said from the start, we have looked at every lead and in most cases — in fact in all cases — that we have pursued, we have not found anything positive," Hishamuddin said.
He said that pictures of three large objects floating in the South China Sea posted Wednesday on a Chinese government website were not debris from the missing plane.
"A Malaysian maritime enforcement agency surveillance plane was dispatched this morning to investigate potential debris shown on Chinese satellite images. We deployed assets, but found nothing. We have contacted the Chinese Embassy who notified us this afternoon the images were released by mistake and did not show any debris from MH370," he said.
Hishamuddin also dismissed a report by the Wall Street Journal that signals sent by the plane's Rolls Royce engine indicated the plane kept flying for up to five hours. He didn't dispute the plane could have kept flying, but said Rolls Royce did not receive any signals from the engine after it vanished from radar.
Earlier in the search, two oil slicks were determined to not be from the plane and an orange object thought to be part of the plane's door was investigated and found to be unrelated.