French travel chaos hours before Olympics

Some 800,000 passengers affected after three high speed rail lines into Paris targeted by arson attacks. The French rail operator, SNCF, says disruption is expected to continue throughout the weekend. Also: In the US, former president Barack Obama backs Vice President Kamala Harris in her election campaign, Open AI launches its rival to the long dominant Google search engine, and two leaders of one of the world's most dangerous and powerful crime syndicates have been arrested in Texas.