As the fate of MH370 continues to remain a mystery, the police are now looking into every possible angle, including the three to four tonnes of mangosteen in the cargo.

Revealing this today, Inspector-General of Police Khalid Abu Bakar said investigators have even identified who had plucked the fruits.

"For example, when we knew there was a load of mangosteens onboard, we had to find out where the mangosteens came from.

"We tracked down who plucked the fruits, who packed them and shipped them out, and who put them on the plane.

 "Then we had to determine who would have received them in China and who paid for it, and for how much.

"Imagine how many people we must interview to rule out sabotage and that is just the mangosteens," he was quoted as saying by the Star .

According to the police chief, who revealed that the food served on the plane was also being scrutinised, the mangosteens came from an orchard in Muar, Johor.

Among the cargo manifest, the spotlight had previously fell on the 200kg of lithium-ion batteries , which are considered highly flammable and have contributed to aviation disasters in the past.

However, MAS chief executive officer Ahmad Jauhari Yahaya and acting Transport Minister Hishammuddin Hussein said the batteries were packed according to international regulations and considered non-hazardous.

In another report, Khalid said the MH370 mystery might never be solved.

"Investigations may go on and on and on. We have to clear every little thing… At the end of the investigations, we may not even know the real cause.

"We may not even know the reason for this incident," he was quoted as saying by the Associated Press .

The police chief had also disclosed that the 227 passengers on the missing Boeing flight had been cleared of the four elements - hijacking, sabotage as well as psychological and personal problems.

However, Khalid said the 12 crew, including the pilot and co-pilot, are still being probed.