Myanmar Rohingya: What you need to know about the crisis
The plight of hundreds of thousands of Rohingya people is said to be the world's fastest growing refugee crisis.
Risking death by sea or on foot, more than half a million have fled the destruction of their homes and persecution in the northern Rakhine province of Myanmar (Burma) for neighbouring Bangladesh since August 2017.
The United Nations described the military offensive in Rakhine, which provoked the exodus, as a "textbook example of ethnic cleansing".
Myanmar's military says it is fighting Rohingya militants and denies targeting civilians.
Who are the Rohingya?
The Rohingya, who numbered around one million in Myanmar at the start of 2017, are one of the many ethnic minorities in the country. Rohingya Muslims represent the largest percentage of Muslims in Myanmar, with the majority living in Rakhine state.
They have their own language and culture and say they are descendants of Arab traders and other groups who have been in the region for generations.
But the government of Myanmar, a predominantly Buddhist country, denies the Rohingya citizenship and even excluded them from the 2014 census, refusing to recognise them as a people.
It sees them as illegal immigrants from Bangladesh.
Since the 1970s, Rohingya have migrated across the region in significant numbers. Estimates of their numbers are often much higher than official figures.
In the last few years, before the latest crisis, thousands of Rohingya were making perilous journeys out of Myanmar to escape communal violence or alleged abuses by the security forces.
Why are they fleeing?
The latest exodus began on 25 August 2017 after Rohingya Arsa militants attacked more than 30 police posts.
Rohingyas arriving in an area known as Cox's Bazaar - a district in Bangladesh - say they fled after troops, backed by local Buddhist mobs, responded by burning their villages and attacking and killing civilians.
At least 6,700 Rohingya, including at least 730 children under the age of five, were killed in the month after the violence broke out, according to Medecins Sans Frontieres (MSF).
Amnesty International says the Myanmar military also raped and abused Rohingya women and girls.
The government, which puts the number of dead at 400, claims that "clearance operations" against the militants ended on 5 September, but BBC correspondents have seen evidence that they continued after that date.
At least 288 villages were partially or totally destroyed by fire in northern Rakhine state after August 2017, according to analysis of satellite imagery by Human Rights Watch.
The imagery shows many areas where Rohingya villages were reduced to smouldering rubble, while nearby ethnic Rakhine villages were left intact.
Extent of destruction
Human Rights Watch say most damage occurred in Maungdaw Township, between 25 August and 25 September 2017 - with many villages destroyed after 5 September, when Myanmar's de facto leader, Aung San Suu Kyi, said security force operations had ended.
What is the scale of the crisis?
The UN says the Rohingya's situation is the "world's fastest growing refugee crisis".
Before August, there were already around 307,500 Rohingya refugees living in camps, makeshift settlements and with host communities, according to the UNHCR. A further 655,000 are estimated to have arrived since August 2017.
Most Rohingya refugees reaching Bangladesh - men, women and children with barely any belongings - have sought shelter in these areas, setting up camp wherever possible in the difficult terrain and with little access to aid, safe drinking water, food, shelter or healthcare.
The largest refugee camp is Kutupalong but limited space means spontaneous settlements have sprung up in the surrounding countryside and nearby Balukhali as refugees keep arriving.
While the Kutupalong refugee camp has grown from 13,901 to 22,241 since August 2017, the number living in makeshift or spontaneous settlements outside the camp has climbed from 99,495 to more than 547,616.
Other sites in the region have also expanded - as of mid-January 2018, there were eight sites occupied by more than 242,000 people.
There are also around 79,000 people staying outside the camps in host communities.
What is being done by the international community?
The need for aid is overwhelming.
- The whole refugee population - almost one million people - require food aid
- 21,677 children under five have been treated for severe acute malnutrition
- 315,000 children under 15 years of age have received a five-in-one vaccination, which includes cover for diptheria, tetanus and whooping cough.
- 44,493 temporary emergency latrines have been built Bangladesh military
- 21,000 metric tonnes of aid has been delivered in 17 airlifts
There has been widespread condemnation of the Myanmar government's actions but talk of sanctions has been more muted:
- The UN Security Council appealed to Myanmar to stop the violence but no sanctions have been imposed
- The UN's human rights chief Zeid Ra'ad al-Hussein has said an act of genocide against Rohingya Muslims by state forces in Myanmar cannot be ruled out
- The US urged Myanmar's troops to "respect the rule of law, stop the violence and end the displacement of civilians from all communities"
- China says the international community "should support the efforts of Myanmar in safeguarding the stability of its national development"
- Bangladesh plans to build more shelters in the Cox's Bazaar area but also wants to limit their travel to allocated areas
- Myanmar urged displaced people to find refuge in temporary camps set up in Rakhine state. In November Bangladesh signed a deal with Myanmar to return hundreds of thousands of Rohingya refugees, but few details have been released
- The UK has pledged £59m in aid to support those fleeing to Bangladesh. UK Prime Minister Theresa May also said the military action in Rakhine had to stop. The UK has suspended training courses for the Myanmar military