KUALA LUMPUR: Officials from Boeing and Rolls Royce will be coming here soon to answer technical questions and provide more details.

Defence Minister Datuk Seri Hishammuddin Hussein said the manufacturer of the MH370 aircraft and its engines has been working closely with the investigation team.

However, he did not specify when the officials will arrive.

Hishammuddin, who is also acting Transport Minister, said more resources are being deployed to the southern search corridor due to the increasing number of leads in the ongoing search and rescue (SAR) operations.

"Operations will not cease in the northern corridor until it is definite that MH370 is not there. Due to the increasing number of leads in the southern corridor, we are currently deploying more assets there. But unless these sightings are confirmed, it will not be fair to the families of the passengers onboard (the plane) to stop operations in the north," he said.

About 20,000 square nautical miles were covered in the southern corridor today after several possible debris were spotted by satellites and aircraft.

They include two orange objects, about one metre in length, and a white-coloured drum detected by Chinese and French satellites which also recorded two radar signatures.

Hishammuddin said Turkmenistan had also confirmed that MH370 did not appear on its radar readings.

He also confirmed that the flight was carrying wooden pallets used to support the weight of goods in the cargo hold, but that possible sightings of pallets in the southern search area have not been linked to the aircraft.