The government NGO Affairs Bureau cleared 30 local and international groups to meet "emergency needs" in camps and said more would follow, Shahdat Hossain, a bureau director, told AFP.
Bangladesh has strictly limited access to Rohingya camps in recent years. It has never given reasons, but the country is sensitive about security and there are fears a Muslim influx could tempt extremist groups.
The camps are currently facing dire shortages of food and medicine, while the World Health Organisation warned Monday of a growing risk of cholera.
The aid groups still only have permission to work for two months in the camps around the border town of Cox's Bazar, Hossain said, and must focus on providing healthcare, sanitation facilities and shelters for the Rohingya.
The new groups include local and international charities. Authorities previously only let four international groups -- including Doctors With Border (MSF) and Action Against Hunger (ACF) -- provide food and healthcare.
Authorities briefly ordered MSF, ACF and Muslim Aid to stop providing aid to the Rohingya in 2012.
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