Malaysia has warned that the reasons for the Malaysia Airlines plane's disappearance may never be known, as Prime Minister Najib Razak heads to Australia for talks on the search.

Malaysia's police chief said that their investigation could "go on and on".

Ten planes and nine ships will search the southern Indian Ocean on Tuesday. A UK submarine has also joined the hunt.

Flight MH370 disappeared on 8 March as it was travelling from Kuala Lumpur to Beijing. It was carrying 239 people.

Mr Najib will arrive in Perth, western Australia, on Wednesday evening. He will visit the new Joint Agency Coordination Centre (JACC), where the southern Indian Ocean search is being led.

He will meet Australian Prime Minister Tony Abbott, and retired air chief marshal Angus Houston, who is leading the JACC.

BBC News