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A "global coalition of inaction" contributed to world's deadliest Ebola outbreak, the BBC reported citing the medical charity Medecins Sans Frontieres.

Its report - a year after the outbreak was declared - suggests early calls for help were ignored by local governments and the World Health Organization.

The charity says "many institutions failed, with tragic and avoidable consequences."

Ebola has killed more than 10,000 people in the last 12 months.

Most deaths occurred in the worst-affected countries of Guinea, Liberia and Sierra Leone.

The first person to succumb to the disease during this outbreak is thought to have been a toddler in a remote part of Guinea. He died in December 2013.

Three months later the WHO officially announced an outbreak. And it was a further five months before the organisation declared it a global health emergency. At this point more than 1,000 people had lost their lives.

Henry Gray, MSF emergency coordinator, told the BBC: "We were well aware this was something different in March and April last year and we did try to bring this to the attention of the WHO but also governments within the countries affected.

"And of course it was frustrating that we weren't heard and that has probably led to the scale of the epidemic we see today."

The charity says it should also have used more of its own resources earlier in the crisis.