Since 2009, devastating oil spills have exposed thousands of fishermen and farmers in the oil-rich kingdom to toxic substances, affecting their health and destroying their farmlands and rivers. The clean-up process, however, is too slow.
Helen Evans, the former global head of safeguarding, says a survey conducted during her 2012-2015 tenure exposed a "culture of sexual abuse" in some Oxfam offices.
The cause of the accident was still unclear, and the helicopters were not equipped with "black box" data recorders that might have explained what happened.
Convictions of security force members are rare in Bangladesh. Rights activists say they frequently carry out unlawful killings and are effectively able to operate in a climate of impunity.
As Operation Euphrates Shield enters its first month, around 20,000 people have so far returned home to the freed Syrian town of Jarablus.
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