BBC在线收听下载:美国国土安全部部长尼尔森辞职

Hello, I'm Neil Nunes with the BBC News.

President Trump has announced that he's replacing his Homeland Security Secretary Kirstjen Nielsen. The President thanked her for her service, but gave no reason for the change. It follows growing anger in the White House at the failure to reduce the number of migrants entering the United States illegally across the southern border. Chris Buckler is in Washington.

As the Secretary of Homeland Security, Kirstjen Nielsen faced widespread criticism for enforcing the Trump administration policy, which led to the separation of children from their parents at the border. Mr. Trump latter change the so-called zero tolerance approach. She will be replaced as acting secretary by Kevin McAleenan who's the current commissioner of US Customs and Border Protection.

The United States has demanded an immediate halt to an offensive by the Libyan war lord Khalifa Haftar on the capital Tripoli. The Secretary of State Mike Pompeo said the US was continuing to press Libyan leaders to return to political talks mediated by the United Nations. Four days of fighting around Tripoli are reported to have left more than twenty people dead. Government forces have threatened to a counteroffensive against general Haftar's stronghold in eastern Libya.

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London has begun enforcing a scheme to clean up its polluted air through an ultra low emission zone for vehicles in the city centre. From today, drivers with the most polluting vehicles have to pay to drive into the central zone. Lorries and buses that aren't compliant will be charged about a hundred and thirty dollars a day. The mayor of London is Sadiq Khan.

In London, we've got a public health emergency. People are changing their behaviors already and the point of this policy is to lead to a bigger change of behavior. You know there are one five children in London, they go to primary school where the air is illegal. We think because of our policies we will govern situation where there are four hundred fifty schools in areas with air is illegal to five in 2020 and zero by 2025. London's mayor Sadiq Khan.

Animal rights activists in Australia have blocked roads and broken into abattoirs in a day of action across the country. They are protesting against the mistreatment of livestock on farms. At least nine people were arrested. Phil Mercer has more details.

Protesters have disrupted rush hour traffic and trends in the center of Melbourne. Other animal rights campaigners have chained themselves to equipment at abattoirs.The demonstrations marked the one year anniversary of the release of a documentarythat used hidden cameras and drones to investigate the abusive livestock in Australia. Farming groups said the film didn't reflect the practices of the industry as a whole.

BBC world news.