Former head of Turing Pharmaceuticals refuses to answer questions at a congressional hearing focused on the company's drug pricing policy.

The ambitious Trans Pacific Partnership (TPP) is formally signed in Auckland even as the US struggles to get the pact ratified in Congress.

US prosecutors can proceed with a sexual assault charge against comedian Bill Cosby, a judge in Pennsylvania rules.

Colombia's President Juan Manuel Santos says he will ask President Obama to help implement an imminent peace agreement with the Farc.

Brazilian President Dilma Rousseff declares war on mosquitoes responsible for spreading the Zika virus in a recorded TV message to the nation.

Syria's government and opposition blame each other for the suspension of talks aimed at ending the country's brutal five-year conflict.

North Korea appears to be preparing to launch a long-range missile, according to South Korea's defence ministry and Japanese media.

Wikileaks founder Julian Assange says he will turn himself over to UK police if a UN panel rules he has not been unlawfully detained on Friday.