Charlotte Gallagher

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Violence has broken out in Bangladesh after Sharif Osman Hadi, a prominent student protest leader who was shot in the head last week, died in hospital.

As news of the 32-year-old's death emerged, hundreds of his supporters took to the streets of Dakar.

Our global affairs reporter, Anne Barisan Etterajan, is following developments.

And this has been an incredibly volatile time for Bangladesh.

We spoke then about the violence last year, the ousting of Sheikh Hasina.

I imagine a lot of people fear in Bangladesh that this could get worse.

And this murder, I know that there have been arrests, but have the police said what the motivations could have been?

and Barisan Etirajan.

Days after the mass shooting at Bondi Beach, the Australian Prime Minister has announced a national gun buyback scheme.

Antony Albanese said the authorities would collect and destroy hundreds of thousands of firearms, including surplus, illegal and newly banned weapons.

Our Sydney correspondent Phil Mercer has more details.

An international team of researchers have used drones to investigate the health of whales, uncovering a dangerous threat to their existence.

The whales were shown to carry a deadly virus which can be linked to mass strandings.

Our environment correspondent Helen Briggs explains how these findings were made.

Scientists have taken to the skies to study the health of whales in the wild.

Drones carrying scientific equipment were hovered over the giant ocean mammals to collect samples of their breath as they came up for air.