Predominantly Muslim Malaysia has spoken out strongly against mostly Buddhist Myanmar over its treatment of its Rohingya minority since violence erupted last October.
In the past 15 days, nearly 300,000 Rohingya Muslims have fled to neighbouring Bangladesh after raids by Rohingya militants triggered a Myanamr security forces crackdown in Rakhine state.
"Based on the reports we have received, (the Rohingya) are discriminated and no mercy is accorded to them," he told reporters at the Subang Airforce base on the outskirts of the capital Kuala Lumpur.
Earlier Najib witnessed the deployment of two airforce cargo planes with food and medical supplies to the port city of Chittagong in Bangladesh.
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"We are sending two planes with biscuits, rice and soap. Malaysia will do whatever it can to help since this is a huge disaster," he said.
Najib also said a reconnaissance team would arrive in Dhaka on Monday consisting of diplomats and military officers to identify further assistance needed by the Rohingya.
Malaysia's armed forces chief said Saturday that Kuala Lumpur would provide a 200-bed military field hospital in Bangladesh if the government there granted permission.
"We have to help because the Rohingya tragedy has reached terrible proportions," he said.
Yesterday, the powerful youth wing of Najib's dominant Malaysia's ruling party led a noisy street protest urging Kuala Lumpur to sever diplomatic ties with Yangon.
Malaysia on Tuesday summoned the Myanmar ambassador to voice its "deep concern" over the situation in Rakhine state, where witnesses said entire villages have been burned.
As of June this year, there are 59,100 Rohingya refugees registered with the UN Refugee Agency in Malaysia.