Iran's supreme leader has called for the "definitive punishment" of those behind the assassination of one of the country's prominent nuclear scientists.
Protesters in Paris have clashed with police as thousands of people demonstrated across France against a proposed new law that would ban the filming of police.
The EU's chief negotiator has arrived in London ahead of the resumption of Brexit talks with his UK counterpart on Saturday, as the deadline to strike a deal moves ever closer.
Ethiopia's prime minister has said the army is moving in on the capital of the northern Tigray region after his 72-hour ultimatum for rebel leaders to lay down their arms expired.
A breakthrough in decoding brain signals could be the first step towards soldiers communicating without having to speak aloud during military operations.
The US Justice Department is quietly amending its execution protocols, to possibly end the use of lethal injection - and clear the way for firing squads and poison gas.